Organic electroluminescent materials and devices

ABSTRACT

Compounds having the structure of Formula M(L A ) x (L B ) y  and Formula III, 
                         
are disclosed. In Formula M(L A ) x (L B ) y , Ligand L A  is
 
                         
and ligand L B  is a mono anionic bidentate ligand. In these compounds, metal M has an atomic number greater than 40; x is 1, 2, or 3; y is 0, 1, or 2; x+y is the oxidation state of metal M; L 11  represents a linking group selected from alkyl, cycloalkyl, aryl, and heteroaryl; L 12  represents a linking group selected from NR 15  and PR 15 ; each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 11 , R 12 , R 13 , R 14 , and R 15  is independently selected from a group of substituents, wherein any adjacent substituents are optionally joined to form a fused or unfused ring; and L A  and L B  are optionally joined to form a ligand that is at least tetradentate. Formulations and devices, such as OLEDs, that include the compound of Formula M(L A ) x (L B ) y (L C ) z  are also described.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No.14/728,553, filed Jun. 2, 2015, which is a non-provisional of U.S.Patent Application Ser. No. 62/017,341, filed Jun. 26, 2014, the entirecontent of which is incorporated herein by reference.

PARTIES TO A JOINT RESEARCH AGREEMENT

The claimed invention was made by, on behalf of, and/or in connectionwith one or more of the following parties to a joint universitycorporation research agreement: The Regents of the University ofMichigan, Princeton University, University of Southern California, andUniversal Display Corporation. The agreement was in effect on and beforethe date the claimed invention was made, and the claimed invention wasmade as a result of activities undertaken within the scope of theagreement.

FIELD OF THE INVENTION

The present invention relates to compounds for use as emitters anddevices, such as organic light emitting diodes, including the same.

BACKGROUND

Opto-electronic devices that make use of organic materials are becomingincreasingly desirable for a number of reasons. Many of the materialsused to make such devices are relatively inexpensive, so organicopto-electronic devices have the potential for cost advantages overinorganic devices. In addition, the inherent properties of organicmaterials, such as their flexibility, may make them well suited forparticular applications such as fabrication on a flexible substrate.Examples of organic opto-electronic devices include organic lightemitting devices (OLEDs), organic phototransistors, organic photovoltaiccells, and organic photodetectors. For OLEDs, the organic materials mayhave performance advantages over conventional materials. For example,the wavelength at which an organic emissive layer emits light maygenerally be readily tuned with appropriate dopants.

OLEDs make use of thin organic films that emit light when voltage isapplied across the device. OLEDs are becoming an increasinglyinteresting technology for use in applications such as flat paneldisplays, illumination, and backlighting. Several OLED materials andconfigurations are described in U.S. Pat. Nos. 5,844,363, 6,303,238, and5,707,745, which are incorporated herein by reference in their entirety.

One application for phosphorescent emissive molecules is a full colordisplay. Industry standards for such a display call for pixels adaptedto emit particular colors, referred to as “saturated” colors. Inparticular, these standards call for saturated red, green, and bluepixels. Color may be measured using CIE coordinates, which are wellknown to the art.

One example of a green emissive molecule is tris(2-phenylpyridine)iridium, denoted Ir(ppy)₃, which has the following structure:

In this, and later figures herein, we depict the dative bond fromnitrogen to metal (here, Ir) as a straight line.

As used herein, the term “organic” includes polymeric materials as wellas small molecule organic materials that may be used to fabricateorganic opto-electronic devices. “Small molecule” refers to any organicmaterial that is not a polymer, and “small molecules” may actually bequite large. Small molecules may include repeat units in somecircumstances. For example, using a long chain alkyl group as asubstituent does not remove a molecule from the “small molecule” class.Small molecules may also be incorporated into polymers, for example as apendent group on a polymer backbone or as a part of the backbone. Smallmolecules may also serve as the core moiety of a dendrimer, whichconsists of a series of chemical shells built on the core moiety. Thecore moiety of a dendrimer may be a fluorescent or phosphorescent smallmolecule emitter. A dendrimer may be a “small molecule,” and it isbelieved that all dendrimers currently used in the field of OLEDs aresmall molecules.

As used herein, “top” means furthest away from the substrate, while“bottom” means closest to the substrate. Where a first layer isdescribed as “disposed over” a second layer, the first layer is disposedfurther away from substrate. There may be other layers between the firstand second layer, unless it is specified that the first layer is “incontact with” the second layer. For example, a cathode may be describedas “disposed over” an anode, even though there are various organiclayers in between.

As used herein, “solution processible” means capable of being dissolved,dispersed, or transported in and/or deposited from a liquid medium,either in solution or suspension form.

A ligand may be referred to as “photoactive” when it is believed thatthe ligand directly contributes to the photoactive properties of anemissive material. A ligand may be referred to as “ancillary” when it isbelieved that the ligand does not contribute to the photoactiveproperties of an emissive material, although an ancillary ligand mayalter the properties of a photoactive ligand.

As used herein, and as would be generally understood by one skilled inthe art, a first “Highest Occupied Molecular Orbital” (HOMO) or “LowestUnoccupied Molecular Orbital” (LUMO) energy level is “greater than” or“higher than” a second HOMO or LUMO energy level if the first energylevel is closer to the vacuum energy level. Since ionization potentials(IP) are measured as a negative energy relative to a vacuum level, ahigher HOMO energy level corresponds to an IP having a smaller absolutevalue (an IP that is less negative). Similarly, a higher LUMO energylevel corresponds to an electron affinity (EA) having a smaller absolutevalue (an EA that is less negative). On a conventional energy leveldiagram, with the vacuum level at the top, the LUMO energy level of amaterial is higher than the HOMO energy level of the same material. A“higher” HOMO or LUMO energy level appears closer to the top of such adiagram than a “lower” HOMO or LUMO energy level.

As used herein, and as would be generally understood by one skilled inthe art, a first work function is “greater than” or “higher than” asecond work function if the first work function has a higher absolutevalue. Because work functions are generally measured as negative numbersrelative to vacuum level, this means that a “higher” work function ismore negative. On a conventional energy level diagram, with the vacuumlevel at the top, a “higher” work function is illustrated as furtheraway from the vacuum level in the downward direction. Thus, thedefinitions of HOMO and LUMO energy levels follow a different conventionthan work functions.

More details on OLEDs, and the definitions described above, can be foundin U.S. Pat. No. 7,279,704, which is incorporated herein by reference inits entirety.

SUMMARY OF THE INVENTION

According to an embodiment, a compound having a structure according toformula M(L_(A))_(x)(L_(B))_(y) is provided. In formulaM(L_(A))_(x)(L_(B))_(y):

ligand L_(A) is

ligand L_(B) is a mono anionic bidentate ligand;

each L_(A) and L_(B) can be the same or different;

M is a metal having an atomic number greater than 40;

x is 1, 2, or 3;

y is 0, 1, or 2;

x+y is the oxidation state of the metal M;

R⁵ represents mono, or di substitution, or no substitution;

R⁶ represents mono, di, or tri substitution, or no substitution;

each R¹, R², R³, R⁴, R⁵, and R⁶ is independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof;

any adjacent R¹, R², R³, R⁴, R⁵, and R⁶ groups are optionally joined toform a fused or unfused ring; and

L_(A) and L_(B) are optionally joined to form a ligand that is at leasttetradentate.

According to another aspect of the present disclosure, a compound havingthe structure of Formula III,

is provided. In the structure of Formula III:

-   -   R¹¹, and R¹² each independently represent mono, or di        substitution, or no substitution;    -   R¹³ and R¹⁴ each independently represent mono, di, tri, or tetra        substitution, or no substitution;    -   L¹¹ represents a linking group selected from the group        consisting of alkyl, cycloalkyl, aryl, and heteroaryl;    -   L¹² represents a linking group selected from the group        consisting of NR¹⁵, and PR¹⁵;    -   R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are each independently selected from        the group consisting of hydrogen, deuterium, halide, alkyl,        cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino,        silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,        heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,        isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and        combinations thereof; and    -   any adjacent L¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are        optionally joined to form a fused or unfused ring.

According to another embodiment, a device comprising one or more organiclight emitting devices is also provided. At least one of the one or moreorganic light emitting devices can include an anode, a cathode, and anorganic layer, disposed between the anode and the cathode, wherein theorganic layer can include a compound selected from the group consistingof Formula M(L_(A))_(x)(L_(B))_(y)(L_(C))_(z), Formula III, andcombinations thereof. The device can be a consumer product, anelectronic component module, an organic light-emitting device, and/or alighting panel.

According to yet another embodiment, a formulation containing a compoundselected from the group consisting of FormulaM(L_(A))_(x)(L_(B))_(y)(L_(C))_(z), Formula III, and combinationsthereof is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an organic light emitting device.

FIG. 2 shows an inverted organic light emitting device that does nothave a separate electron transport layer.

FIG. 3 shows Ligand LA and Formula III as disclosed herein.

FIG. 4 is a chart showing normalized PL intensity versus wavelength forCompound Ir872 and Comparative Example 13 taken at 77K.

FIG. 5 is a chart showing normalized PL intensity versus wavelength forCompound Ir872 and Comparative Example 13 taken at room temperature(˜22° C.).

FIG. 6 is a chart showing normalized PL intensity versus wavelength forCompound Ir888 and Comparative Example 14 taken in PMMA.

DETAILED DESCRIPTION

Generally, an OLED comprises at least one organic layer disposed betweenand electrically connected to an anode and a cathode. When a current isapplied, the anode injects holes and the cathode injects electrons intothe organic layer(s). The injected holes and electrons each migratetoward the oppositely charged electrode. When an electron and holelocalize on the same molecule, an “exciton,” which is a localizedelectron-hole pair having an excited energy state, is formed. Light isemitted when the exciton relaxes via a photoemissive mechanism. In somecases, the exciton may be localized on an excimer or an exciplex.Non-radiative mechanisms, such as thermal relaxation, may also occur,but are generally considered undesirable.

The initial OLEDs used emissive molecules that emitted light from theirsinglet states (“fluorescence”) as disclosed, for example, in U.S. Pat.No. 4,769,292, which is incorporated by reference in its entirety.Fluorescent emission generally occurs in a time frame of less than 10nanoseconds.

More recently, OLEDs having emissive materials that emit light fromtriplet states (“phosphorescence”) have been demonstrated. Baldo et al.,“Highly Efficient Phosphorescent Emission from OrganicElectroluminescent Devices,” Nature, vol. 395, 151-154, 1998;(“Baldo-I”) and Baldo et al., “Very high-efficiency green organiclight-emitting devices based on electrophosphorescence,” Appl. Phys.Lett., vol. 75, No. 3, 4-6 (1999) (“Baldo-II”), which are incorporatedby reference in their entireties. Phosphorescence is described in moredetail in U.S. Pat. No. 7,279,704 at cols. 5-6, which are incorporatedby reference.

FIG. 1 shows an organic light emitting device 100. The figures are notnecessarily drawn to scale. Device 100 may include a substrate 110, ananode 115, a hole injection layer 120, a hole transport layer 125, anelectron blocking layer 130, an emissive layer 135, a hole blockinglayer 140, an electron transport layer 145, an electron injection layer150, a protective layer 155, a cathode 160, and a barrier layer 170.Cathode 160 is a compound cathode having a first conductive layer 162and a second conductive layer 164. Device 100 may be fabricated bydepositing the layers described, in order. The properties and functionsof these various layers, as well as example materials, are described inmore detail in U.S. Pat. No. 7,279,704 at cols. 6-10, which areincorporated by reference.

More examples for each of these layers are available. For example, aflexible and transparent substrate-anode combination is disclosed inU.S. Pat. No. 5,844,363, which is incorporated by reference in itsentirety. An example of a p-doped hole transport layer is m-MTDATA dopedwith F₄-TCNQ at a molar ratio of 50:1, as disclosed in U.S. PatentApplication Publication No. 2003/0230980, which is incorporated byreference in its entirety. Examples of emissive and host materials aredisclosed in U.S. Pat. No. 6,303,238 to Thompson et al., which isincorporated by reference in its entirety. An example of an n-dopedelectron transport layer is BPhen doped with Li at a molar ratio of 1:1,as disclosed in U.S. Patent Application Publication No. 2003/0230980,which is incorporated by reference in its entirety. U.S. Pat. Nos.5,703,436 and 5,707,745, which are incorporated by reference in theirentireties, disclose examples of cathodes including compound cathodeshaving a thin layer of metal such as Mg:Ag with an overlyingtransparent, electrically-conductive, sputter-deposited ITO layer. Thetheory and use of blocking layers is described in more detail in U.S.Pat. No. 6,097,147 and U.S. Patent Application Publication No.2003/0230980, which are incorporated by reference in their entireties.Examples of injection layers are provided in U.S. Patent ApplicationPublication No. 2004/0174116, which is incorporated by reference in itsentirety. A description of protective layers may be found in U.S. PatentApplication Publication No. 2004/0174116, which is incorporated byreference in its entirety.

FIG. 2 shows an inverted OLED 200. The device includes a substrate 210,a cathode 215, an emissive layer 220, a hole transport layer 225, and ananode 230. Device 200 may be fabricated by depositing the layersdescribed, in order. Because the most common OLED configuration has acathode disposed over the anode, and device 200 has cathode 215 disposedunder anode 230, device 200 may be referred to as an “inverted” OLED.Materials similar to those described with respect to device 100 may beused in the corresponding layers of device 200. FIG. 2 provides oneexample of how some layers may be omitted from the structure of device100.

The simple layered structure illustrated in FIGS. 1 and 2 is provided byway of non-limiting example, and it is understood that embodiments ofthe invention may be used in connection with a wide variety of otherstructures. The specific materials and structures described areexemplary in nature, and other materials and structures may be used.Functional OLEDs may be achieved by combining the various layersdescribed in different ways, or layers may be omitted entirely, based ondesign, performance, and cost factors. Other layers not specificallydescribed may also be included. Materials other than those specificallydescribed may be used. Although many of the examples provided hereindescribe various layers as comprising a single material, it isunderstood that combinations of materials, such as a mixture of host anddopant, or more generally a mixture, may be used. Also, the layers mayhave various sublayers. The names given to the various layers herein arenot intended to be strictly limiting. For example, in device 200, holetransport layer 225 transports holes and injects holes into emissivelayer 220, and may be described as a hole transport layer or a holeinjection layer. In one embodiment, an OLED may be described as havingan “organic layer” disposed between a cathode and an anode. This organiclayer may comprise a single layer, or may further comprise multiplelayers of different organic materials as described, for example, withrespect to FIGS. 1 and 2.

Structures and materials not specifically described may also be used,such as OLEDs comprised of polymeric materials (PLEDs) such as disclosedin U.S. Pat. No. 5,247,190 to Friend et al., which is incorporated byreference in its entirety. By way of further example, OLEDs having asingle organic layer may be used. OLEDs may be stacked, for example asdescribed in U.S. Pat. No. 5,707,745 to Forrest et al, which isincorporated by reference in its entirety. The OLED structure maydeviate from the simple layered structure illustrated in FIGS. 1 and 2.For example, the substrate may include an angled reflective surface toimprove out-coupling, such as a mesa structure as described in U.S. Pat.No. 6,091,195 to Forrest et al., and/or a pit structure as described inU.S. Pat. No. 5,834,893 to Bulovic et al., which are incorporated byreference in their entireties.

Unless otherwise specified, any of the layers of the various embodimentsmay be deposited by any suitable method. For the organic layers,preferred methods include thermal evaporation, ink-jet, such asdescribed in U.S. Pat. Nos. 6,013,982 and 6,087,196, which areincorporated by reference in their entireties, organic vapor phasedeposition (OVPD), such as described in U.S. Pat. No. 6,337,102 toForrest et al., which is incorporated by reference in its entirety, anddeposition by organic vapor jet printing (OVJP), such as described inU.S. Pat. No. 7,431,968, which is incorporated by reference in itsentirety. Other suitable deposition methods include spin coating andother solution based processes. Solution based processes are preferablycarried out in nitrogen or an inert atmosphere. For the other layers,preferred methods include thermal evaporation. Preferred patterningmethods include deposition through a mask, cold welding such asdescribed in U.S. Pat. Nos. 6,294,398 and 6,468,819, which areincorporated by reference in their entireties, and patterning associatedwith some of the deposition methods such as ink-jet and OVJD. Othermethods may also be used. The materials to be deposited may be modifiedto make them compatible with a particular deposition method. Forexample, substituents such as alkyl and aryl groups, branched orunbranched, and preferably containing at least 3 carbons, may be used insmall molecules to enhance their ability to undergo solution processing.Substituents having 20 carbons or more may be used, and 3-20 carbons isa preferred range. Materials with asymmetric structures may have bettersolution processibility than those having symmetric structures, becauseasymmetric materials may have a lower tendency to recrystallize.Dendrimer substituents may be used to enhance the ability of smallmolecules to undergo solution processing.

Devices fabricated in accordance with embodiments of the presentinvention may further optionally comprise a barrier layer. One purposeof the barrier layer is to protect the electrodes and organic layersfrom damaging exposure to harmful species in the environment includingmoisture, vapor and/or gases, etc. The barrier layer may be depositedover, under or next to a substrate, an electrode, or over any otherparts of a device including an edge. The barrier layer may comprise asingle layer, or multiple layers. The barrier layer may be formed byvarious known chemical vapor deposition techniques and may includecompositions having a single phase as well as compositions havingmultiple phases. Any suitable material or combination of materials maybe used for the barrier layer. The barrier layer may incorporate aninorganic or an organic compound or both. The preferred barrier layercomprises a mixture of a polymeric material and a non-polymeric materialas described in U.S. Pat. No. 7,968,146, PCT Pat. Application Nos.PCT/US2007/023098 and PCT/US2009/042829, which are herein incorporatedby reference in their entireties. To be considered a “mixture”, theaforesaid polymeric and non-polymeric materials comprising the barrierlayer should be deposited under the same reaction conditions and/or atthe same time. The weight ratio of polymeric to non-polymeric materialmay be in the range of 95:5 to 5:95. The polymeric material and thenon-polymeric material may be created from the same precursor material.In one example, the mixture of a polymeric material and a non-polymericmaterial consists essentially of polymeric silicon and inorganicsilicon.

Devices fabricated in accordance with embodiments of the invention canbe incorporated into a wide variety of electronic component modules (orunits) that can be incorporated into a variety of electronic products orintermediate components. Examples of such electronic products orintermediate components include display screens, lighting devices suchas discrete light source devices or lighting panels, etc. that can beutilized by the end-user product manufacturers. Such electroniccomponent modules can optionally include the driving electronics and/orpower source(s). Devices fabricated in accordance with embodiments ofthe invention can be incorporated into a wide variety of consumerproducts that have one or more of the electronic component modules (orunits) incorporated therein. Such consumer products would include anykind of products that include one or more light source(s) and/or one ormore of some type of visual displays. Some examples of such consumerproducts include flat panel displays, computer monitors, medicalmonitors, televisions, billboards, lights for interior or exteriorillumination and/or signaling, heads-up displays, fully or partiallytransparent displays, flexible displays, laser printers, telephones,cell phones, tablets, phablets, personal digital assistants (PDAs),laptop computers, digital cameras, camcorders, viewfinders,micro-displays, 3-D displays, vehicles, a large area wall, theater orstadium screen, or a sign. Various control mechanisms may be used tocontrol devices fabricated in accordance with the present invention,including passive matrix and active matrix. Many of the devices areintended for use in a temperature range comfortable to humans, such as18 degrees C. to 30 degrees C., and more preferably at room temperature(20-25 degrees C.), but could be used outside this temperature range,for example, from −40 degree C. to +80 degree C.

The materials and structures described herein may have applications indevices other than OLEDs. For example, other optoelectronic devices suchas organic solar cells and organic photodetectors may employ thematerials and structures. More generally, organic devices, such asorganic transistors, may employ the materials and structures.

The term “halo,” “halogen,” or “halide” as used herein includesfluorine, chlorine, bromine, and iodine.

The term “alkyl” as used herein contemplates both straight and branchedchain alkyl radicals. Preferred alkyl groups are those containing fromone to fifteen carbon atoms and includes methyl, ethyl, propyl,isopropyl, butyl, isobutyl, tert-butyl, and the like. Additionally, thealkyl group may be optionally substituted.

The term “cycloalkyl” as used herein contemplates cyclic alkyl radicals.Preferred cycloalkyl groups are those containing 3 to 7 carbon atoms andincludes cyclopropyl, cyclopentyl, cyclohexyl, and the like.Additionally, the cycloalkyl group may be optionally substituted.

The term “alkenyl” as used herein contemplates both straight andbranched chain alkene radicals. Preferred alkenyl groups are thosecontaining two to fifteen carbon atoms. Additionally, the alkenyl groupmay be optionally substituted.

The term “alkynyl” as used herein contemplates both straight andbranched chain alkyne radicals. Preferred alkynyl groups are thosecontaining two to fifteen carbon atoms. Additionally, the alkynyl groupmay be optionally substituted.

The terms “aralkyl” or “arylalkyl” as used herein are usedinterchangeably and contemplate an alkyl group that has as a substituentan aromatic group. Additionally, the aralkyl group may be optionallysubstituted.

The term “heterocyclic group” as used herein contemplates aromatic andnon-aromatic cyclic radicals. Hetero-aromatic cyclic radicals also meansheteroaryl. Preferred hetero-non-aromatic cyclic groups are thosecontaining 3 or 7 ring atoms which includes at least one hetero atom,and includes cyclic amines such as morpholino, piperdino, pyrrolidino,and the like, and cyclic ethers, such as tetrahydrofuran,tetrahydropyran, and the like. Additionally, the heterocyclic group maybe optionally substituted.

The term “aryl” or “aromatic group” as used herein contemplatessingle-ring groups and polycyclic ring systems. The polycyclic rings mayhave two or more rings in which two carbons are common to two adjoiningrings (the rings are “fused”) wherein at least one of the rings isaromatic, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryl,heterocycles, and/or heteroaryls. Additionally, the aryl group may beoptionally substituted.

The term “heteroaryl” as used herein contemplates single-ringhetero-aromatic groups that may include from one to three heteroatoms,for example, pyrrole, furan, thiophene, imidazole, oxazole, thiazole,triazole, pyrazole, pyridine, pyrazine and pyrimidine, and the like. Theterm heteroaryl also includes polycyclic hetero-aromatic systems havingtwo or more rings in which two atoms are common to two adjoining rings(the rings are “fused”) wherein at least one of the rings is aheteroaryl, e.g., the other rings can be cycloalkyls, cycloalkenyls,aryl, heterocycles, and/or heteroaryls. Additionally, the heteroarylgroup may be optionally substituted.

The alkyl, cycloalkyl, alkenyl, alkynyl, aralkyl, heterocyclic group,aryl, and heteroaryl may be optionally substituted with one or moresubstituents selected from the group consisting of hydrogen, deuterium,halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy,amino, cyclic amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl,alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof.

As used herein, “substituted” indicates that a substituent other than His bonded to the relevant position, such as carbon. Thus, for example,where R¹ is mono-substituted, then one R¹ must be other than H.Similarly, where R¹ is di-substituted, then two of R¹ must be other thanH. Similarly, where R¹ is unsubstituted, R¹ is hydrogen for allavailable positions.

The “aza” designation in the fragments described herein, i.e.aza-dibenzofuran, aza-dibenzothiophene, etc. means that one or more ofthe C—H groups in the respective fragment can be replaced by a nitrogenatom, for example, and without any limitation, azatriphenyleneencompasses both dibenzo[f,h]quinoxaline and dibenzo[f,h]quinoline. Oneof ordinary skill in the art can readily envision other nitrogen analogsof the aza-derivatives described above, and all such analogs areintended to be encompassed by the terms as set forth herein.

It is to be understood that when a molecular fragment is described asbeing a substituent or otherwise attached to another moiety, its namemay be written as if it were a fragment (e.g. phenyl, phenylene,naphthyl, dibenzofuryl) or as if it were the whole molecule (e.g.benzene, naphthalene, dibenzofuran). As used herein, these differentways of designating a substituent or attached fragment are considered tobe equivalent.

According to one embodiment, a compound having a structure according toformula M(L_(A))_(x)(L_(B))_(y) is described. In FormulaM(L_(A))_(x)(L_(B))_(y):

ligand L_(A) is

ligand L_(B) is a mono anionic bidentate ligand;

each L_(A) and L_(B) can be the same or different;

M is a metal having an atomic number greater than 40;

x is 1, 2, or 3;

y is 0, 1, or 2;

x+y is the oxidation state of the metal M;

R⁵ represents mono, or di substitution, or no substitution;

R⁶ represents mono, di, or tri substitution, or no substitution;

each R¹, R², R³, R⁴, R⁵, and R⁶ is independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof;

any adjacent R¹, R², R³, R⁴, R⁵, and R⁶ groups are optionally joined toform a fused or unfused ring; and

L_(A) and L_(B) are optionally joined to form a ligand that is at leasttetradentate.

In some embodiments, M is selected from the group consisting of Ir, Rh,Re, Ru, Os, Pt, Au, and Cu. In some embodiments, M is Pt.

In some embodiments, at least one of R¹, R², R³, and R⁴ is not hydrogenor deuterium. In some embodiments, R¹, R², R³, and R⁴ are eachindependently selected from the group consisting of hydrogen, deuterium,alkyl, cycloalkyl, and combinations thereof.

In some more specific embodiments. the compound has the structure ofFormula I:

where ring A and ring B are each independently a 5- or 6-memberedcarbocyclic or heterocyclic ring. In some such embodiments, L¹, L² andL³ are independently selected from the group consisting of a directbond, alkyl, cycloalkyl, BR, NR, PR, O, S, Se, C═O, S═O, SO₂, SiRR′, andGeRR′; In some such embodiments, Z¹ and Z² are each independently anitrogen atom or a carbon atom; In some embodiments, R⁷ and R⁸ eachrepresent mono, di, tri, or tetra substitution, or no substitution, andR, R′, R⁷ and R⁸ are each independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof. In some embodiments, twoadjacent substituents R, R′, R⁷ and R⁸ are optionally joined to form afused or unfused ring. In some embodiments, n1 is 0 or 1; n2 is 0 or 1;and n3 is 0 or 1. In some embodiments, n1+n2+n3 is at least 2. In someembodiments, direct bonds disclosed herein can be selected from a singlebond and a double bond.

In some embodiments, n2 is 1 and n3 is 0. In some embodiments, n2 is 0and n3 is 1. In some embodiments, n2 is 1 and n3 is 1.

In some embodiments, rings A and B are selected from the groupconsisting of benzene, pyradine, pyrazole, benzopyrazole, naphthalene,isoquinoline, aza-isoquinoline, carbazole, and dibenzofuran, each ofwhich may be, optionally, further substituted.

In some more specific embodiments, the compound has the structure ofFormula II:

In some embodiments, the compound is selected from the group consistingof:

Compound Pt1 through Pt12, each represented by the formula

wherein in Compound Pt1: R = H, in Compound Pt2: R = Me, in CompoundPt3: R = Et, in Compound Pt4: R = ^(i)Pr, in Compound Pt5: R =neopentyl, in Compound Pt6: R = ^(i)Bu, in Compound Pt7: R = ^(t)Bu, inCompound Pt8: R = Ph, in Compound Pt9: R = 4-biphenyl, in Compound Pt10:R = 2,6-(^(i)Pr)₂Ph, in Compound Pt11: R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt12: R = 2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt13 throughPt21, each represented by the formula

wherein in Compound Pt13: R = Me, in Compound Pt14: R = Et, in CompoundPt15: R = ^(i)Pr, in Compound Pt16: R = neopentyl, in Compound Pt17: R =^(i)Bu, in Compound Pt18: R = ^(t)Bu, in Compound Pt19: R = Ph, inCompound Pt20: R = 2,6-(Me)₂Ph, in Compound Pt21: R = 2,6-(^(i)Pr)₂Ph, ,Compound Pt22 through Pt30, each represented by the formula

wherein in Compound Pt22: R = Me, in Compound Pt23: R = Et, in CompoundPt24: R = ^(i)Pr, in Compound Pt25: R = neopentyl, in Compound Pt26: R =^(i)Bu, in Compound Pt27: R = ^(t)Bu, in Compound Pt28: R = Ph, inCompound Pt29: R = 2,6-(Me)₂Ph, in Compound Pt30: R = 2,6-(^(i)Pr)₂Ph, ,Compound Pt31 through Pt42, each represented by the formula

wherein in Compound Pt31: R = H, in Compound Pt32: R = Me, in CompoundPt33: R = Et, in Compound Pt34: R = ^(i)Pr, in Compound Pt35: R =neopentyl, in Compound Pt36: R = ^(i)Bu, in Compound Pt37: R = ^(t)Bu,in Compound Pt38: R = Ph, in Compound Pt39: R = 4-biphenyl, in CompoundPt40: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt41: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt42: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt43 through Pt54, eachrepresented by the formula

wherein in Compound Pt43: R = H, in Compound Pt44: R = Me, in CompoundPt45: R = Et, in Compound Pt46: R = ^(i)Pr, in Compound Pt47: R =neopentyl, in Compound Pt48: R = ^(i)Bu, in Compound Pt49: R = ^(t)Bu,in Compound Pt50: R = Ph, in Compound Pt51: R = 4-biphenyl, in CompoundPt52: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt53: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt54: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt55 through Pt66, eachrepresented by the formula

wherein in Compound Pt55: R = H, in Compound Pt56: R = Me, in CompoundPt57: R = Et, in Compound Pt58: R = ^(i)Pr, in Compound Pt59: R =neopentyl, in Compound Pt60: R = ^(i)Bu, in Compound Pt61: R = ^(t)Bu,in Compound Pt62: R = Ph, in Compound Pt63: R = 4-biphenyl, in CompoundPt64: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt65: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt66: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt67 through Pt75, eachrepresented by the formula

wherein in Compound Pt67: R = Me, in Compound Pt68: R = Et, in CompoundPt69: R = ^(i)Pr, in Compound Pt70: R = neopentyl, in Compound Pt71: R =^(i)Bu, in Compound Pt72: R = ^(t)Bu, in Compound Pt73: R = Ph, inCompound Pt74: R = 2,6-(Me)₂Ph, in Compound Pt75: R = 2,6-(^(i)Pr)₂Ph, ,Compound Pt76 through Pt84, each represented by the formula

wherein in Compound Pt76: R = Me, in Compound Pt77: R = Et, in CompoundPt78: R = ^(i)Pr, in Compound Pt79: R = neopentyl, in Compound Pt80: R =^(i)Bu, in Compound Pt81: R = ^(t)Bu, in Compound Pt82: R = Ph, inCompound Pt83: R = 2,6-(Me)₂Ph, in Compound Pt84: R = 2,6-(^(i)Pr)₂Ph, ,Compound Pt85 through Pt93, each represented by the formula

wherein in Compound Pt85: R = Me, in Compound Pt86: R = Et, in CompoundPt87: R = ^(i)Pr, in Compound Pt88: R = neopentyl, in Compound Pt89: R =^(i)Bu, in Compound Pt90: R = ^(t)Bu, in Compound Pt91: R = Ph, inCompound Pt92: R = 2,6-(Me)₂Ph, in Compound Pt93: R = 2,6-(^(i)Pr)₂Ph, ,Compound Pt94 through Pt102, each represented by the formula

wherein in Compound Pt94: R = Me, in Compound Pt95: R = Et, in CompoundPt96: R = ^(i)Pr, in Compound Pt97: R = neopentyl, in Compound Pt98: R =^(i)Bu, in Compound Pt99: R = ^(t)Bu, in Compound Pt100: R = Ph, inCompound Pt101: R = 2,6-(Me)₂Ph, in Compound Pt102: R = 2,6-(^(i)Pr)₂Ph,, Compound Pt103 through Pt111, each represented by the formula

wherein in Compound Pt103: R = Me, in Compound Pt104: R = Et, inCompound Pt105: R = ^(i)Pr, in Compound Pt106: R = neopentyl, inCompound Pt107: R = ^(i)Bu, in Compound Pt108: R = ^(t)Bu, in CompoundPt109: R = Ph, in Compound Pt110: R = 2,6-(Me)₂Ph, in Compound Pt111: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt112 through Pt120, each represented bythe formula

wherein in Compound Pt112: R = Me, in Compound Pt113: R = Et, inCompound Pt114: R = ^(i)Pr, in Compound Pt115: R = neopentyl, inCompound Pt116: R = ^(i)Bu, in Compound Pt117: R = ^(t)Bu, in CompoundPt118: R = Ph, in Compound Pt119: R = 2,6-(Me)₂Ph, in Compound Pt120: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt121 through Pt132, each represented bythe formula

wherein in Compound Pt121: R = H, in Compound Pt122: R = Me, in CompoundPt123: R = Et, in Compound Pt124: R = ^(i)Pr, in Compound Pt125: R =neopentyl, in Compound Pt126: R = ^(i)Bu, in Compound Pt127: R = ^(t)Bu,in Compound Pt128: R = Ph, in Compound Pt129: R = 4-biphenyl, inCompound Pt130: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt131: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt132: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt133 through Pt144, eachrepresented by the formula

wherein in Compound Pt133: R = H, in Compound Pt134: R = Me, in CompoundPt135: R = Et, in Compound Pt136: R = ^(i)Pr, in Compound Pt137: R =neopentyl, in Compound Pt138: R = ^(i)Bu, in Compound Pt139: R = ^(t)Bu,in Compound Pt140: R = Ph, in Compound Pt141: R = 4-biphenyl, inCompound Pt142: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt143: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt144: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt145 through Pt156, eachrepresented by the formula

wherein in Compound Pt145: R = H, in Compound Pt146: R = Me, in CompoundPt147: R = Et, in Compound Pt148: R = ^(i)Pr, in Compound Pt149: R =neopentyl, in Compound Pt150: R = ^(i)Bu, in Compound Pt151: R = ^(t)Bu,in Compound Pt152: R = Ph, in Compound Pt153: R = 4-biphenyl, inCompound Pt154: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt155: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt156: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt157 through Pt165, eachrepresented by the formula

wherein in Compound Pt157: R = Me, in Compound Pt158: R = Et, inCompound Pt159: R = ^(i)Pr, in Compound Pt160: R = neopentyl, inCompound Pt161: R = ^(i)Bu, in Compound Pt162: R = ^(t)Bu, in CompoundPt163: R = Ph, in Compound Pt164: R = 2,6-(Me)₂Ph, in Compound Pt165: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt166 through Pt174, each represented bythe formula

wherein in Compound Pt166: R = Me, in Compound Pt167: R = Et, inCompound Pt168: R = ^(i)Pr, in Compound Pt169: R = neopentyl, inCompound Pt170: R = ^(i)Bu, in Compound Pt171: R = ^(t)Bu, in CompoundPt172: R = Ph, in Compound Pt173: R = 2,6-(Me)₂Ph, in Compound Pt174: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt175 through Pt183, each represented bythe formula

wherein in Compound Pt175: R = Me in Compound Pt176: R = Et in CompoundPt177: R = ^(i)Pr in Compound Pt178: R = neopentyl in Compound Pt179: R= ^(i)Bu in Compound Pt180: R = ^(t)Bu in Compound Pt181: R = Ph inCompound Pt182: R = 2,6-(Me)₂Ph in Compound Pt183: R = 2,6-(^(i)Pr)₂Ph,Compound Pt184 through Pt192, each represented by the formula

wherein in Compound Pt184: R = Me, n Compound Pt185: R = Et, n CompoundPt186: R = ^(i)Pr, n Compound Pt187: R = neopentyl, n Compound Pt188: R= ^(i)Bu, n Compound Pt189: R = ^(t)Bu, n Compound Pt190: R = Ph, nCompound Pt191: R = 2,6-(Me)₂Ph, n Compound Pt192: R = 2,6-(^(i)Pr)₂Ph,, Compound Pt193 through Pt201, each represented by the formula

wherein in Compound Pt193: R = Me, in Compound Pt194: R = Et, inCompound Pt195: R = ^(i)Pr, in Compound Pt196: R = neopentyl, inCompound Pt197: R = ^(i)Bu, in Compound Pt198: R = ^(t)Bu, in CompoundPt199: R = Ph, in Compound Pt200: R = 2,6-(Me)₂Ph, in Compound Pt201: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt202 through Pt210, each represented bythe formula

wherein in Compound Pt202: R = Me, in Compound Pt203: R = Et, inCompound Pt204: R = ^(i)Pr, in Compound Pt205: R = neopentyl, inCompound Pt206: R = ^(i)Bu, in Compound Pt207: R = ^(t)Bu in CompoundPt208: R = Ph, in Compound Pt209: R = 2,6-(Me)₂Ph, in Compound Pt210: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt211 through Pt222, each represented bythe formula

wherein in Compound Pt211: R = H, in Compound Pt212: R = Me, in CompoundPt213: R = Et, in Compound Pt214: R = ^(i)Pr, in Compound Pt215: R =neopentyl, in Compound Pt216: R = ^(i)Bu, in Compound Pt217: R = ^(t)Bu,in Compound Pt218: R = Ph, in Compound Pt219: R = 4-biphenyl, inCompound Pt220: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt221: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt222: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt223 through Pt234, eachrepresented by the formula

wherein in Compound Pt223: R = H in Compound Pt224: R = Me in CompoundPt225: R = Et in Compound Pt226: R = ^(i)Pr in Compound Pt227: R =neopentyl in Compound Pt228: R = ^(i)Bu in Compound Pt229: R = ^(t)Bu inCompound Pt230: R = Ph in Compound Pt231: R = 4-biphenyl in CompoundPt232: R = 2,6-(^(i)Pr)₂Ph in Compound Pt233: R =2,6-(^(i)Pr)₂-4-biphenyl in Compound Pt234: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt235 through Pt246, eachrepresented by the formula

wherein in Compound Pt235: R = H in Compound Pt236: R = Me in CompoundPt237: R = Et in Compound Pt238: R = ^(i)Pr in Compound Pt239: R =neopentyl in Compound Pt240: R = ^(i)Bu in Compound Pt241: R = ^(t)Bu inCompound Pt242: R = Ph in Compound Pt243: R = 4-biphenyl in CompoundPt244: R = 2,6-(^(i)Pr)₂Ph in Compound Pt245: R =2,6-(^(i)Pr)₂-4-biphenyl in Compound Pt246: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt247 through Pt255, eachrepresented by the formula

wherein in Compound Pt247: R = Me, in Compound Pt248: R = Et, inCompound Pt249: R = ^(i)Pr, in Compound Pt250: R = neopentyl, inCompound Pt251: R = ^(i)Bu, in Compound Pt252: R = ^(t)Bu, in CompoundPt253: R = Ph, in Compound Pt254: R = 2,6-(Me)₂Ph, in Compound Pt255: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt256 through Pt264, each represented bythe formula

wherein in Compound Pt256: R = Me, in Compound Pt257: R = Et, inCompound Pt258: R = ^(i)Pr, in Compound Pt259: R = neopentyl, inCompound Pt260: R = ^(i)Bu, in Compound Pt261: R = ^(t)Bu, in CompoundPt262: R = Ph, in Compound Pt263: R = 2,6-(Me)₂Ph, in Compound Pt264: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt265 through Pt273, each represented bythe formula

wherein in Compound Pt265: R = Me, in Compound Pt266: R = Et, inCompound Pt267: R = ^(i)Pr, in Compound Pt268: R = neopentyl, inCompound Pt269: R = ^(i)Bu, in Compound Pt270: R = ^(t)Bu, in CompoundPt271: R = Ph, in Compound Pt272: R = 2,6-(Me)₂Ph, in Compound Pt273: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt274 through Pt282, each represented bythe formula

wherein in Compound Pt274: R = Me, in Compound Pt275: R = Et, inCompound Pt276: R = ^(i)Pr, in Compound Pt277: R = neopentyl, inCompound Pt278: R = ^(i)Bu, in Compound Pt279: R = ^(t)Bu, in CompoundPt280: R = Ph, in Compound Pt282: R = 2,6-(Me)₂Ph, in Compound Pt283: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt283 through Pt291, each represented bythe formula

wherein in Compound Pt283: R = Me, in Compound Pt284: R = Et, inCompound Pt285: R = ^(i)Pr, in Compound Pt286: R = neopentyl, inCompound Pt287: R = ^(i)Bu, in Compound Pt288: R = ^(t)Bu, in CompoundPt289: R = Ph, in Compound Pt290: R = 2,6-(Me)₂Ph, in Compound Pt291: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt292 through Pt300, each represented bythe formula

wherein in Compound Pt292: R = Me, in Compound Pt293: R = Et, inCompound Pt294: R = ^(i)Pr, in Compound Pt295: R = neopentyl, inCompound Pt296: R = ^(i)Bu, in Compound Pt297: R = ^(t)Bu, in CompoundPt298: R = Ph, in Compound Pt299: R = 2,6-(Me)₂Ph, in Compound Pt300: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt301 through Pt312, each represented bythe formula

wherein in Compound Pt301: R = H, in Compound Pt302: R = Me, in CompoundPt303: R = Et, in Compound Pt304: R = ^(i)Pr, in Compound Pt305: R =neopentyl, in Compound Pt306: R = ^(i)Bu, in Compound Pt307: R = ^(t)Bu,in Compound Pt308: R = Ph, in Compound Pt309: R = 4-biphenyl, inCompound Pt310: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt311: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt312: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt313 through Pt324, eachrepresented by the formula

wherein in Compound Pt313: R = H, in Compound Pt314: R = Me, in CompoundPt315: R = Et, in Compound Pt316: R = ^(i)Pr, in Compound Pt317: R =neopentyl, in Compound Pt318: R = ^(i)Bu, in Compound Pt319: R = ^(t)Bu,in Compound Pt320: R = Ph, in Compound Pt321: R = 4-biphenyl, inCompound Pt322: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt323: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt324: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt325 through Pt336, eachrepresented by the formula

wherein in Compound Pt325: R = H, in Compound Pt326: R = Me, in CompoundPt327: R = Et, in Compound Pt328: R = ^(i)Pr, in Compound Pt329: R =neopentyl, in Compound Pt330: R = ^(i)Bu, in Compound Pt331: R = ^(t)Bu,in Compound Pt332: R = Ph, in Compound Pt333: R = 4-biphenyl, inCompound Pt334: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt335: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt336: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt337 through Pt345, eachrepresented by the formula

wherein in Compound Pt337: R = Me, in Compound Pt338: R = Et, inCompound Pt339: R = ^(i)Pr, in Compound Pt340: R = neopentyl, inCompound Pt341: R = ^(i)Bu, in Compound Pt342: R = ^(t)Bu, in CompoundPt343: R = Ph, in Compound Pt344: R = 2,6-(Me)₂Ph, in Compound Pt345: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt346 through Pt354, each represented bythe formula

wherein in Compound Pt346: R = Me, in Compound Pt347: R = Et, inCompound Pt348: R = ^(i)Pr, in Compound Pt349: R = neopentyl, inCompound Pt350: R = ^(i)Bu, in Compound Pt351: R = ^(t)Bu, in CompoundPt352: R = Ph, in Compound Pt353: R = 2,6-(Me)₂Ph, in Compound Pt354: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt355 through Pt363, each represented bythe formula

wherein in Compound Pt355: R = Me, in Compound Pt356: R = Et, inCompound Pt357: R = ^(i)Pr, in Compound Pt358: R = neopentyl, inCompound Pt359: R = ^(i)Bu, in Compound Pt360: R = ^(t)Bu, in CompoundPt361: R = Ph, in Compound Pt362: R = 2,6-(Me)₂Ph, in Compound Pt363: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt364 through Pt372, each represented bythe formula

wherein in Compound Pt364: R = Me, in Compound Pt365: R = Et, inCompound Pt366: R = ^(i)Pr, in Compound Pt367: R = neopentyl, inCompound Pt368: R = ^(i)Bu, in Compound Pt369: R = ^(t)Bu, in CompoundPt370: R = Ph, in Compound Pt371: R = 2,6-(Me)₂Ph, in Compound Pt372: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt373 through Pt381, each represented bythe formula

wherein in Compound Pt373: R = Me, in Compound Pt374: R = Et, inCompound Pt375: R = ^(i)Pr, in Compound Pt376: R = neopentyl, inCompound Pt377: R = ^(i)Bu, in Compound Pt378: R = ^(t)Bu, in CompoundPt379: R = Ph, in Compound Pt380: R = 2,6-(Me)₂Ph, in Compound Pt381: R= 2,6-(^(i)Pr)₂Pr, , Compound Pt382 through Pt390, each represented bythe formula

wherein in Compound Pt382: R = Me, in Compound Pt383: R = Et, inCompound Pt384: R = ^(i)Pr, in Compound Pt385: R = neopentyl, inCompound Pt386: R = ^(i)Bu, in Compound Pt387: R = ^(t)Bu in CompoundPt388: R = Ph, in Compound Pt389: R = 2,6-(Me)₂Ph, in Compound Pt390: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt391 through Pt402 each represented bythe formula

wherein in Compound Pt391: R = H, in Compound Pt392: R = Me, in CompoundPt393: R = Et, in Compound Pt394: R = ^(i)Pr, in Compound Pt395: R =neopentyl, in Compound Pt396: R = ^(i)Bu, in Compound Pt397: R = ^(t)Bu,in Compound Pt398: R = Ph, in Compound Pt399: R = 4-biphenyl, inCompound Pt400: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt401: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt402: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt403 through Pt411, eachrepresented by the formula

wherein in Compound Pt403: R = Me, in Compound Pt404: R = Et, inCompound Pt405: R = ^(i)Pr, in Compound Pt406: R = neopentyl, inCompound Pt407: R = ^(i)Bu, in Compound Pt408: R = ^(t)Bu, in CompoundPt409: R = Ph in Compound Pt410: R = 2,6-(Me)₂Ph, in Compound Pt411: R =2,6-(^(i)Pr)₂Ph, , Compound Pt412 through Pt420, each represented by theformula

wherein in Compound Pt412: R = Me, in Compound Pt413: R = Et, inCompound Pt414: R = ^(i)Pr, in Compound Pt415: R = neopentyl, inCompound Pt416: R = ^(i)Bu, in Compound Pt417: R = ^(t)Bu, in CompoundPt418: R = Ph, in Compound Pt419: R = 2,6-(Me)₂Ph, in Compound Pt420: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt421 through Pt432, each represented bythe formula

wherein in Compound Pt421: R = H, in Compound Pt422: R = Me, in CompoundPt423: R = Et, in Compound Pt424: R = ^(i)Pr, in Compound Pt425: R =neopentyl, in Compound Pt426: R = ^(i)Bu, in Compound Pt447: R = ^(t)Bu,in Compound Pt428: R = Ph, in Compound Pt429: R = 4-biphenyl, inCompound Pt430: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt431: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt432: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt433 through Pt444, eachrepresented by the formula

wherein in Compound Pt433: R = H, in Compound Pt434: R = Me, in CompoundPt435: R = Et, in Compound Pt436: R = ^(i)Pr, in Compound Pt437: R =neopentyl, in Compound Pt438: R = ^(i)Bu, in Compound Pt439: R = ^(t)Bu,in Compound Pt440: R = Ph, in Compound Pt441: R = 4-biphenyl, inCompound Pt442: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt443: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt444: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt445 through Pt456, eachrepresented by the formula

wherein in Compound Pt445: R = H, in Compound Pt446: R = Me, in CompoundPt447: R = Et, in Compound Pt448: R = ^(i)Pr, in Compound Pt449: R =neopentyl, in Compound Pt450: R = ^(i)Bu, in Compound Pt451: R = ^(t)Bu,in Compound Pt452: R = Ph, in Compound Pt453: R = 4-biphenyl, inCompound Pt454: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt455: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt456: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt457 through Pt465,represented by the formula

wherein in Compound Pt457: R = Me, in Compound Pt458: R = Et, inCompound Pt459: R = ^(i)Pr, in Compound Pt460: R = neopentyl, inCompound Pt461: R = ^(i)Bu, in Compound Pt462: R = ^(t)Bu, in CompoundPt463: R = Ph, in Compound Pt464: R = 2,6-(Me)₂Ph, in Compound Pt465: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt466 through Pt474, each represented bythe formula

wherein in Compound Pt466: R = Me, in Compound Pt467: R = Et, inCompound Pt468: R = ^(i)Pr, in Compound Pt469: R = neopentyl, inCompound Pt470: R = ^(i)Bu, in Compound Pt471: R = ^(t)Bu, in CompoundPt472: R = Ph, in Compound Pt473: R = 2,6-(Me)₂Ph, in Compound Pt474: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt475 through Pt483, each represented bythe formula

wherein in Compound Pt475: R = Me, in Compound Pt476: R = Et, inCompound Pt477: R = ^(i)Pr, in Compound Pt478: R = neopentyl, inCompound Pt479: R = ^(i)Bu, in Compound Pt480: R = ^(t)Bu, in CompoundPt481: R = Ph, in Compound Pt482: R = 2,6-(Me)₂Ph, in Compound Pt483: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt484 through Pt492, each represented bythe formula

wherein in Compound Pt484: R = Me, in Compound Pt485: R = Et, inCompound Pt486: R = ^(i)Pr, in Compound Pt487: R = neopentyl, inCompound Pt488: R = ^(i)Bu, in Compound Pt489: R = ^(t)Bu, in CompoundPt490: R = Ph, in Compound Pt491: R = 2,6-(Me)₂Ph, in Compound Pt492: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt493 through Pt501, each represented bythe formula

wherein in Compound Pt493: R = Me, in Compound Pt494: R = Et, inCompound Pt495: R = ^(i)Pr, in Compound Pt496: R = neopentyl, inCompound Pt497: R = ^(i)Bu, in Compound Pt498: R = ^(t)Bu, in CompoundPt499: R = Ph, Compound Pt500: R = 2,6-(Me)₂Ph, Compound Pt501: R =2,6-(^(i)Pr)₂Ph, , Compound Pt502 through Pt510, each represented by theformula

wherein in Compound Pt502: R = Me, in Compound Pt503: R = Et, inCompound Pt504: R = ^(i)Pr, in Compound Pt505: R = neopentyl, inCompound Pt506: R = ^(i)Bu, in Compound Pt507: R = ^(t)Bu, in CompoundPt508: R = Ph, in Compound Pt509: R = 2,6-(Me)₂Ph, in Compound Pt510: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt511 through Pt522, each represented bythe formula

wherein in Compound Pt511: R = H, in Compound Pt512: R = Me, in CompoundPt513: R = Et, in Compound Pt514: R = ^(i)Pr, in Compound Pt515: R =neopentyl, in Compound Pt516: R = ^(i)Bu, in Compound Pt517: R = ^(t)Bu,in Compound Pt518: R = Ph, in Compound Pt519: R = 4-biphenyl, inCompound Pt520: R = 2,6-(^(i)Pr)₂Ph in Compound Pt521: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt522: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt523 through Pt531, eachrepresented by the formula

wherein in Compound Pt523: R = Me, in Compound Pt524: R = Et, inCompound Pt525: R = ^(i)Pr, in Compound Pt526: R = neopentyl, inCompound Pt527: R = ^(i)Bu, in Compound Pt528: R = ^(t)Bu, in CompoundPt529: R = Ph, in Compound Pt530: R = 2,6-(Me)₂Ph, in Compound Pt531: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt532 through Pt540, each represented bythe formula

wherein in Compound Pt532: R = Me, in Compound Pt533: R = Et, inCompound Pt534: R = ^(i)Pr, in Compound Pt535: R = neopentyl, inCompound Pt536: R = ^(i)Bu, in Compound Pt537: R = ^(t)Bu, in CompoundPt538: R = Ph, in Compound Pt539: R = 2,6-(Me)₂Ph, in Compound Pt540: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt541 through Pt552, each represented bythe formula

wherein in Compound Pt541: R = H, in Compound Pt542: R = Me, in CompoundPt543: R = Et, in Compound Pt544: R = ^(i)Pr, in Compound Pt545: R =neopentyl, in Compound Pt546: R = ^(i)Bu, in Compound Pt547: R = ^(t)Bu,in Compound Pt548: R = Ph, in Compound Pt549: R = 4-biphenyl, inCompound Pt550: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt551: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt552: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt553 through Pt564, eachrepresented by the formula

wherein in Compound Pt553: R = H, in Compound Pt554: R = Me, in CompoundPt555: R = Et, in Compound Pt556: R = ^(i)Pr, in Compound Pt557: R =neopentyl, in Compound Pt558: R = ^(i)Bu, in Compound Pt559: R = ^(t)Bu,in Compound Pt560: R = Ph, in Compound Pt561: R = 4-biphenyl, inCompound Pt562: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt563: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt564: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt565 through Pt576, eachrepresented by the formula

wherein in Compound Pt565: R = H, in Compound Pt566: R = Me, in CompoundPt567: R = Et, in Compound Pt568: R = ^(i)Pr, in Compound Pt569: R =neopentyl, in Compound Pt570: R = ^(i)Bu, in Compound Pt571: R = ^(t)Bu,in Compound Pt572: R = Ph, in Compound Pt573: R = 4-biphenyl, inCompound Pt574: R = 2,6-(^(i)Pr)₂Ph, in Compound Pt575: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt576: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt577 through Pt585, eachrepresented by the formula

wherein in Compound Pt577: R = Me, in Compound Pt578: R = Et, inCompound Pt579: R = ^(i)Pr, in Compound Pt580: R = neopentyl, inCompound Pt581: R = ^(i)Bu, in Compound Pt582: R = ^(t)Bu, in CompoundPt583: R = Ph, in Compound Pt584: R = 2,6-(Me)₂Ph, in Compound Pt585: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt586 through Pt594, each represented bythe formula

wherein in Compound Pt586: R = Me, in Compound Pt587: R = Et, inCompound Pt588: R = ^(i)Pr, in Compound Pt589: R = neopentyl, inCompound Pt590: R = ^(i)Bu, in Compound Pt591: R = ^(t)Bu, in CompoundPt592: R = Ph, in Compound Pt593: R = 2,6-(Me)₂Ph, in Compound Pt594: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt595 through Pt603, each represented bythe formula

wherein in Compound Pt595: R = Me, in Compound Pt596: R = Et, inCompound Pt597: R = ^(i)Pr, in Compound Pt598: R = neopentyl, inCompound Pt599: R = ^(i)Bu, in Compound Pt600: R = ^(t)Bu, in CompoundPt601: R = Ph, in Compound Pt602: R = 2,6-(Me)₂Ph, in Compound Pt603: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt604 through Pt612, each represented bythe formula

wherein in Compound Pt604: R = Me, in Compound Pt605: R = Et, inCompound Pt606: R = ^(i)Pr, in Compound Pt607: R = neopentyl, inCompound Pt608: R = ^(i)Bu, in Compound Pt609: R = ^(t)Bu, in CompoundPt610: R = Ph, in Compound Pt611: R = 2,6-(Me)₂Ph, in Compound Pt612: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt613 through Pt621, each represented bythe formula

wherein in Compound Pt613: R = Me, in Compound Pt614: R = Et, inCompound Pt615: R = ^(i)Pr, in Compound Pt616: R = neopentyl, inCompound Pt617: R = ^(i)Bu, in Compound Pt618: R = ^(t)Bu, in CompoundPt619: R = Ph, in Compound Pt620: R = 2,6-(Me)₂Ph, in Compound Pt621: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt622 through Pt630, each represented bythe formula

wherein in Compound Pt622: R = Me, in Compound Pt623: R = Et, inCompound Pt624: R = ^(i)Pr, in Compound Pt625: R = neopentyl, inCompound Pt626: R = ^(i)Bu, in Compound Pt627: R = ^(t)Bu, in CompoundPt628: R = Ph, in Compound Pt629: R = 2,6-(Me)₂Ph, in Compound Pt630: R= 2,6-(^(i)Pr)₂Ph, , Compound Pt631 through Pt645, each represented bythe formula

wherein in Compound Pt631: R′ = H, R = Me, in Compound Pt632: R′ = H, R= Et, in Compound Pt633: R′ = H, R = ^(i)Pr, in Compound Pt634: R′ = H,R = Ph, in Compound Pt635: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt636: R′ = Me, R = Me, in Compound Pt637: R′ = Me, R = Et, in CompoundPt638: R′ = Me, R = ^(i)Pr, in Compound Pt639: R′ = Me, R = Ph, inCompound Pt640: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt641: R′ =Ph, R = Me, in Compound Pt642: R′ = Ph, R = Et, in Compound Pt643: R′ =Ph, R = ^(i)Pr, in Compound Pt644: R′ = Ph, R = Ph, in Compound Pt645:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt646 through Pt660, eachrepresented by the formula

wherein in Compound Pt646: R′ = H, R = Me, in Compound Pt647: R′ = H, R= Et, in Compound Pt648: R′ = H, R = ^(i)Pr, in Compound Pt649: R′ = H,R = Ph, in Compound Pt650: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt651: R′ = Me, R = Me, in Compound Pt652: R′ = Me, R = Et, in CompoundPt653: R′ = Me, R = ^(i)Pr, in Compound Pt654: R′ = Me, R = Ph, inCompound Pt655: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt656: R′ =Ph, R = Me, in Compound Pt657: R′ = Ph, R = Et, in Compound Pt658: R′ =Ph, R = ^(i)Pr, in Compound Pt659: R′ = Ph, R = Ph, in Compound Pt660:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt661 through Pt675, eachrepresented by the formula

wherein in Compund Pt661: R′ = H, R = Me, in Compund Pt662: R′ = H, R =Et, in Compund Pt663: R′ = H, R = ^(i)Pr, in Compund Pt664: R′ = H, R =Ph, in Compund Pt665: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in Compund Pt666: R′= Me, R = Me, in Compund Pt667: R′ = Me, R = Et, in Compund Pt668: R′ =Me, R = ^(i)Pr, in Compund Pt669: R′ = Me, R = Ph, in Compund Pt670: R′= Me, R = 2,6-(^(i)Pr)₂Ph, in Compund Pt671: R′ = Ph, R = Me, in CompundPt672: R′ = Ph, R = Et, in Compund Pt673: R′ = Ph, R = ^(i)Pr, inCompund Pt674: R′ = Ph, R = Ph, in Compund Pt675: R′ = Ph, R =2,6-(^(i)Pr)₂Ph, , Compound Pt676 through Pt690, each represented by theformula

wherein in Compound Pt676: R′ = H, R = Me, in Compound Pt677: R = H, R =Et, in Compound Pt678: R′ = H, R = ^(i)Pr, in Compound Pt679: R′ = H, R= Ph, in Compound Pt680: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt681:R′ = Me, R = Me, in Compound Pt682: R′ = Me, R = Et, in Compound Pt683:R′ = Me, R = ^(i)Pr, in Compound Pt684: R′ = Me, R = Ph, in CompoundPt685: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt686: R′ = Ph, R = Me,in Compound Pt687: R′ = Ph, R = Et, in Compound Pt688: R′ = Ph, R =^(i)Pr, in Compound Pt689: R′ = Ph, R = Ph, in Compound Pt690: R′ = Ph,R = 2,6-(^(i)Pr)₂Ph, , Compound Pt691 through Pt705, each represented bythe formula

wherein in Compound Pt691: R′ = H, R = Me, in Compound Pt692: R′ = H, R= Et, in Compound Pt693: R′ = H, R = ^(i)Pr, in Compound Pt694: R′ = H,R = Ph, in Compound Pt695: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt696: R′ = Me, R = Me, in Compound Pt697: R′ = Me, R = Et, in CompoundPt698: R′ = Me, R = ^(i)Pr, in Compound Pt699: R′ = Me, R = Ph, inCompound Pt700: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt701: R′ =Ph, R = Me, in Compound Pt702: R′ = Ph, R = Et, in Compound Pt703: R′ =Ph, R = ^(i)Pr, in Compound Pt704: R′ = Ph, R = Ph, in Compound Pt705:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt706 through Pt720, eachrepresented by the formula

wherein in Compound Pt706: R′ = H, R = Me, in Compound Pt707: R′ = H, R= Et, in Compound Pt708: R′ = H, R = ^(i)Pr, in Compound Pt709: R′ = H,R = Ph, in Compound Pt710: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt711: R′ = Me, R = Me, in Compound Pt712: R′ = Me, R = Et, in CompoundPt713: R′ = Me, R = ^(i)Pr, in Compound Pt714: R′ = Me, R = Ph, inCompound Pt715: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt716: R′ =Ph, R = Me, in Compound Pt717: R′ = Ph, R = Et, in Compound Pt718: R′ =Ph, R = ^(i)Pr, in Compound Pt719: R′ = Ph, R = Ph, in Compound Pt720:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt721 through Pt735, eachrepresented by the formula

wherein in Compund Pt721: R = H, R = Me, in Compund Pt722: R′ = H, R =Et, in Compund Pt723: R′ = H, R = ^(i)Pr, in Compund Pt724: R′ = H, R =Ph, in Compund Pt725: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in Compund Pt726: R′= Me, R = Me, in Compund Pt727: R′ = Me, R = Et, in Compund Pt728: R′ =Me, R = ^(i)Pr, in Compund Pt729: R′ = Me, R = Ph, in Compund Pt730: R′= Me, R = 2,6-(^(i)Pr)₂Ph, in Compund Pt731: R′ = Ph, R = Me, in CompundPt732: R′ = Ph, R = Et, in Compund Pt733: R′ = Ph, R = ^(i)Pr, inCompund Pt734: R′ = Ph, R = Ph, in Compund Pt735: R′ = Ph, R =2,6-(^(i)Pr)₂Ph, , Compound Pt736 through Pt750, each represented by theformula

wherein in Compound Pt736: R′ = H, R = Me, in Compound Pt737: R′ = H, R= Et, in Compound Pt738: R′ = H, R = ^(i)Pr, in Compound Pt739: R′ = H,R = Ph, in Compound Pt740: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt741: R′ = Me, R = Me, in Compound Pt742: R′ = Me, R = Et, in CompoundPt743: R′ = Me, R = ^(i)Pr, in Compound Pt744: R′ = Me, R = Ph, inCompound Pt745: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt746: R′ =Ph, R = Me, in Compound Pt747: R′ = Ph, R = Et, in Compound Pt748: R′ =Ph, R = ^(i)Pr, in Compound Pt749: R′ = Ph, R = Ph, in Compound Pt750:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt751 through Pt765, eachrepresented by the formula

wherein in Compound Pt751: R′ = H, R = Me, in Compound Pt752: R′ = H, R= Et, in Compound Pt753: R′ = H, R = ^(i)Pr, in Compound Pt754: R′ = H,R = Ph, in Compound Pt755: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt756: R′ = Me, R = Me, in Compound Pt757: R′ = Me, R = Et, in CompoundPt758: R′ = Me, R = ^(i)Pr, in Compound Pt759: R′ = Me, R = Ph, inCompound Pt760: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt761: R′ =Ph, R = Me, in Compound Pt762: R′ = Ph, R = Et, in Compound Pt763: R′ =Ph, R = ^(i)Pr, in Compound Pt764: R′ = Ph, R = Ph, in Compound Pt765:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt766 through Pt780, eachrepresented by the formula

wherein in Compound Pt766: R′ = H, R = Me, in Compound Pt767: R′ = H, R= Et, in Compound Pt768: R′ = H, R = ^(i)Pr, in Compound Pt769: R′ = H,R = Ph, in Compound Pt770: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt771: R′ = Me, R = Me, in Compound Pt772: R′ = Me, R = Et, in CompoundPt773: R′ = Me, R = ^(i)Pr, in Compound Pt774: R′ = Me, R = Ph, inCompound Pt775: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt776: R′ =Ph, R = Me, in Compound Pt777: R′ = Ph, R = Et, in Compound Pt778: R′ =Ph, R = ^(i)Pr, in Compound Pt779: R′ = Ph, R = Ph, in Compound Pt780:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt781 through Pt795, eachrepresented by the formula

wherein in Compound Pt781: R′ = H, R = Me, in Compound Pt782: R′ = H, R= Et, in Compound Pt783: R′ = H, R = ^(i)Pr, in Compound Pt784: R′ = H,R = Ph, in Compound Pt785: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt786: R′ = Me, R = Me, in Compound Pt787: R′ = Me, R = Et, in CompoundPt788: R′ = Me, R = ^(i)Pr, in Compound Pt789: R′ = Me, R = Ph, inCompound Pt790: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt791: R′ =Ph, R = Me, in Compound Pt792: R′ = Ph, R = Et, in Compound Pt793: R′ =Ph, R = ^(i)Pr, in Compound Pt794: R′ = Ph, R = Ph, in Compound Pt795:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt796 through Pt810, eachrepresented by the formula

wherein in Compound Pt796: R′ = H, R = Me, in Compound Pt797: R′ = H, R= Et, in Compound Pt798: R′ = H, R = ^(i)Pr, in Compound Pt799: R′ = H,R = Ph, in Compound Pt800: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt801: R′ = Me, R = Me, in Compound Pt802: R′ = Me, R = Et, in CompoundPt803: R′ = Me, R = ^(i)Pr, in Compound Pt804: R′ = Me, R = Ph, inCompound Pt805: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt806: R′ =Ph, R = Me, in Compound Pt807: R′ = Ph, R = Et, in Compound Pt808: R′ =Ph, R = ^(i)Pr, in Compound Pt809: R′ = Ph, R = Ph, in Compound Pt810:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt811 through Pt825, eachrepresented by the formula

wherein in Compound Pt811: R′ = H, R = Me, in Compound Pt812: R′ = H, R= Et, in Compound Pt813: R′ = H, R = ^(i)Pr, in Compound Pt814: R′ = H,R = Ph, in Compound Pt815: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt816: R′ = Me, R = Me, in Compound Pt817: R′ = Me, R = Et, in CompoundPt818: R′ = Me, R = ^(i)Pr, in Compound Pt819: R′ = Me, R = Ph, inCompound Pt820: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt821: R′ =Ph, R = Me, in Compound Pt822: R′ = Ph, R = Et, in Compound Pt823: R′ =Ph, R = ^(i)Pr, in Compound Pt824: R′ = Ph, R = Ph, in Compound Pt825:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt826 through Pt840, eachrepresented by the formula

wherein in Compound Pt826: R′ = H, R = Me, in Compound Pt827: R′ = H, R= Et, in Compound Pt828: R′ = H, R = ^(i)Pr, in Compound Pt829: R′ = H,R = Ph, in Compound Pt830: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt831: R′ = Me, R = Me, in Compound Pt832: R′ = Me, R = Et, in CompoundPt833: R′ = Me, R = ^(i)Pr, in Compound Pt834: R′ = Me, R = Ph, inCompound Pt835: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt836: R′ =Ph, R = Me, in Compound Pt837: R′ = Ph, R = Et, in Compound Pt838: R′ =Ph, R = ^(i)Pr, in Compound Pt839: R′ = Ph, R = Ph, in Compound Pt840:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt841 through Pt855, eachrepresented by the formula

wherein in Compound Pt841: R′ = H, R = Me, in Compound Pt842: R′ = H, R= Et, in Compound Pt843: R′ = H, R = ^(i)Pr, in Compound Pt844: R′ = H,R = Ph, in Compound Pt845: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt846: R′ = Me, R = Me, in Compound Pt847: R′ = Me, R = Et, in CompoundPt848: R′ = Me, R = ^(i)Pr, in Compound Pt849: R′ = Me, R = Ph, inCompound Pt850: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt851: R′ =Ph, R = Me, in Compound Pt852: R′ = Ph, R = Et, in Compound Pt853: R′ =Ph, R = ^(i)Pr, in Compound Pt854: R′ = Ph, R = Ph, in Compound Pt855:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt856 through Pt870, eachrepresented by the formula

wherein in Compound Pt856: R′ = H, R = Me, in Compound Pt857: R′ = H, R= Et, in Compound Pt858: R′ = H, R = ^(i)Pr, in Compound Pt859: R′ = H,R = Ph, in Compound Pt860: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt861: R′ = Me, R = Me, in Compound Pt862: R′ = Me, R = Et, in CompoundPt863: R′ = Me, R = ^(i)Pr, in Compound Pt864: R′ = Me, R = Ph, inCompound Pt865: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt866: R′ =Ph, R = Me, in Compound Pt867: R′ = Ph, R = Et, in Compound Pt868: R′ =Ph, R = ^(i)Pr, in Compound Pt869: R′ = Ph, R = Ph, in Compound Pt870:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt871 through Pt885, eachrepresented by the formula

wherein in Compound Pt871: R′ = H, R = Me, in Compound Pt872: R′ = H, R= Et, in Compound Pt873: R′ = H, R = ^(i)Pr, in Compound Pt874: R′ = H,R = Ph, in Compound Pt875: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt876: R′ = Me, R = Me, in Compound Pt877: R′ = Me, R = Et, in CompoundPt878: R′ = Me, R = ^(i)Pr, in Compound Pt879: R′ = Me, R = Ph, inCompound Pt880: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt881: R′ =Ph, R = Me, in Compound Pt882: R′ = Ph, R = Et, in Compound Pt883: R′ =Ph, R = ^(i)Pr, in Compound Pt884: R′ = Ph, R = Ph, in Compound Pt885:R′ = Ph, R = 2,6-(^(i)Pr)₂Ph, , Compound Pt886 through Pt900, eachrepresented by the formula

wherein in Compound Pt886: R = H, R = Me, in Compound Pt887: R′ = H, R =Et, in Compound Pt888: R′ = H, R = ^(i)Pr, in Compound Pt889: R′ = H, R= Ph, in Compound Pt890: R′ = H, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt891:R′ = Me, R = Me, in Compound Pt892: R′ = Me, R = Et, in Compound Pt893:R′ = Me, R = ^(i)Pr, in Compound Pt894: R′ = Me, R = Ph, in CompoundPt895: R′ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt896: R′ = Ph, R = Me,in Compound Pt897: R′ = Ph, R = Et, in Compound Pt898: R′ = Ph, R =^(i)Pr, in Compound Pt899: R′ = Ph, R = Ph, in Compound Pt900: R′ = Ph,R = 2,6-(^(i)Pr)₂Ph, , Compound Pt901 through Pt912, each represented bythe formula

wherein in Compound Pt901: R′ = H, R = Me, in Compound Pt902: R′ = H, R= Et, in Compound Pt903: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt904: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt905: R′ = Me, R = Me, in Compound Pt906: R′ = Me, R = Et, in CompoundPt907: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt908: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt909: R′ = Ph, R =Me, in Compound Pt910: R′ = Ph, R = Et, in Compound Pt911: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt912: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt913 through Pt924, eachrepresented by the formula

wherein in Compound Pt913: R′ = H, R = Me, in Compound Pt914: R′ = H, R= Et, in Compound Pt915: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt916: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt917: R′ = Me, R = Me, in Compound Pt918: R′ = Me, R = Et, in CompoundPt919: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt920: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt921: R′ = Ph, R =Me, in Compound Pt922: R′ = Ph, R = Et, in Compound Pt923: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt924: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt925 through Pt936, eachrepresented by the formula

wherein in Compound Pt925: R′ = H, R = Me, in Compound Pt926: R′ = H, R= Et, in Compound Pt927: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt928: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt929: R′ = Me, R = Me, in Compound Pt930: R′ = Me, R = Et, in CompoundPt931: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt932: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt933: R′ = Ph, R =Me, in Compound Pt934: R′ = Ph, R = Et, in Compound Pt935: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt936: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt937 through Pt948, eachrepresented by the formula

wherein in Compound Pt937: R′ = H, R = Me, in Compound Pt938: R′ = H, R= Et, in Compound Pt939: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt940: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt941: R′ = Me, R = Me, in Compound Pt942: R′ = Me, R = Et, in CompoundPt943: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt944: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt945: R′ = Ph, R =Me, in Compound Pt946: R′ = Ph, R = Et, in Compound Pt947: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt948: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt949 through Pt960, eachrepresented by the formula

wherein in Compound Pt949: R′ = H, R = Me, in Compound Pt950: R′ = H, R= Et, in Compound Pt951: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt952: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt953: R′ = Me, R = Me, in Compound Pt954: R′ = Me, R = Et, in CompoundPt955: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt956: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt957: R′ = Ph, R =Me, in Compound Pt958: R′ = Ph, R = Et, in Compound Pt959: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt960: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt961 through Pt972, eachrepresented by the formula

wherein in Compound Pt961: R′ = H, R = Me, in Compound Pt962: R′ = H, R= Et, in Compound Pt963: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt964: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt965: R′ = Me, R = Me, in Compound Pt966: R′ = Me, R = Et, in CompoundPt967: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt968: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt969: R′ = Ph, R =Me, in Compound Pt970: R′ = Ph, R = Et, in Compound Pt971: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt972: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt973 through Pt984, eachrepresented by the formula

wherein in Compound Pt973: R′ = H, R = Me, in Compound Pt974: R′ = H, R= Et, in Compound Pt975: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt976: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt977: R′ = Me, R = Me, in Compound Pt978: R′ = Me, R = Et, in CompoundPt979: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt980: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt981: R′ = Ph, R =Me, in Compound Pt982: R′ = Ph, R = Et, in Compound Pt983: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt984: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt985 through Pt996, eachrepresented by the formula

wherein in Compound Pt985: R′ = H, R = Me, in Compound Pt986: R′ = H, R= Et, in Compound Pt987: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt988: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt989: R′ = Me, R = Me, in Compound Pt990: R′ = Me, R = Et, in CompoundPt991: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt992: R′ =Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt993: R′ = Ph, R =Me, in Compound Pt994: R′ = Ph, R = Et, in Compound Pt995: R′ = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt996: R′ = Ph, R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt997 through Pt1008, eachrepresented by the formula

wherein in Compound Pt997: R′ = H, R = Me, in Compound Pt998: R′ = H, R= Et, in Compound Pt999: R′ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, inCompound Pt1000: R′ = H, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in CompoundPt1001: R′ = Me, R = Me, in Compound Pt1002: R′ = Me, R = Et, inCompound Pt1003: R′ = Me, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1004: R′ = Me, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1005:R′ = Ph, R = Me, in Compound Pt1006: R′ = Ph, R = Et, in CompoundPt1007: R′ = Ph, R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1008: R′ =Ph, R = 2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt1009 through Pt1023,each represented by the formula

wherein in Compound Pt1009: R′ = H, R″ = H, R = H, in Compound Pt1010:R′ = H, R″ = H, R = Me, in Compound Pt1011: R′ = H, R″ = H, R = Ph, inCompound Pt1012: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt1013: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1014: R′ = H, R″ = Me, R = H, in Compound Pt1015: R′ = H, R″ = Me, R =Me, in Compound Pt1016: R′ = H, R″ = Me, R = Ph, in Compound Pt1017: R′= H, R″ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1018: R′ = H, R″ = Me,R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1019: R′ = Me, R″ = H, R =H, in Compound Pt1020: R′ = Me, R″ = H, R = Me, in Compound Pt1021: R′ =Me, R″ = H, R = Ph, in Compound Pt1022: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂Ph, in Compound Pt1023: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂-4-biphenyl, , Compound Pt1024 through Pt1038, eachrepresented by the formula

wherein in Compound Pt1024: R′ = H, R″ = H, R = H, in Compound Pt1025:R′ = H, R″ = H, R = Me, in Compound Pt1026: R′ = H, R″ = H, R = Ph, inCompound Pt1027: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt1028: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1029: R′ = H, R″ = Me, R = H, in Compound Pt1030: R′ = H, R″ = Me, R =Me, in Compound Pt1031: R′ = H, R″ = Me, R = Ph, in Compound Pt1032: R′= H, R″ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1033: R′ = H, R″ = Me,R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1034: R′ = Me, R″ = H, R =H, in Compound Pt1035: R′ = Me, R″ = H, R = Me, in Compound Pt1036: R′ =Me, R″ = H, R = Ph, in Compound Pt1037: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂Ph, in Compound Pt1038: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂-4-biphenyl, , Compound Pt1039 through Pt1053, eachrepresented by the formula

wherein in Compound Pt1039: R′ = H, R″ = H, R = H, in Compound Pt1040:R′ = H, R″ = H, R = Me, in Compound Pt1041: R′ = H, R″ = H, R = Ph, inCompound Pt1042: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt1043: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1044: R′ = H, R″ = Me, R = H, in Compound Pt1045: R′ = H, R″ = Me, R =Me, in Compound Pt1046: R′ = H, R″ = Me, R = Ph, in Compound Pt1047: R′= H, R″ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1048: R′ = H, R″ = Me,R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1049: R′ = Me, R″ = H, R =H, in Compound Pt1050: R′ = Me, R″ = H, R = Me, in Compound Pt1051: R′ =Me, R″ = H, R = Ph, in Compound Pt1052: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂Ph, in Compound Pt1053: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂-4-biphenyl, , Compound Pt1054 through Pt1068, eachrepresented by the formula

wherein in Compound Pt1054: R′ = H, R″ = H, R = H, in Compound Pt1055:R′ = H, R″ = H, R = Me, in Compound Pt1056: R′ = H, R″ = H, R = Ph, inCompound Pt1057: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt1058: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1059: R′ = H, R″ = Me, R = H, in Compound Pt1060: R′ = H, R″ = Me, R =Me, in Compound Pt1061: R′ = H, R″ = Me, R = Ph, in Compound Pt1062: R′= H, R″ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1063: R′ = H, R″ = Me,R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1064: R′ = Me, R″ = H, R =H, in Compound Pt1065: R′ = Me, R″ = H, R = Me, in Compound Pt1066: R′ =Me, R″ = H, R = Ph, in Compound Pt1067: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂Ph, in Compound Pt1068: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂-4-biphenyl, , Compound Pt1069 through Pt1083, eachrepresented by the formula

wherein in Compound Pt1069: R′ = H, R″ = H, R = H, in Compound Pt1070:R′ = H, R″ = H, R = Me, in Compound Pt1071: R′ = H, R″ = H, R = Ph, inCompound Pt1072: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂Ph, in CompoundPt1073: R′ = H, R″ = H, R = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1074: R′ = H, R″ = Me, R = H, in Compound Pt1075: R′ = H, R″ = Me, R =Me, in Compound Pt1076: R′ = H, R″ = Me, R = Ph, in Compound Pt1077: R′= H, R″ = Me, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1078: R′ = H, R″ = Me,R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1079: R′ = Me, R″ = H, R =H, in Compound Pt1080: R′ = Me, R″ = H, R = Me, in Compound Pt1081: R′ =Me, R″ = H, R = Ph, in Compound Pt1082: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂Ph, in Compound Pt1083: R′ = Me, R″ = H, R =2,6-(^(i)Pr)₂-4-biphenyl, , Compound Pt1084 through Pt1097, eachrepresented by the formula

wherein in Compound Pt1084: R = Me, R′ = H, in Compound Pt1085: R = Me,R′ = Me, in Compound Pt1086: R = Me, R′ = ^(i)Pr, in Compound Pt1087: R= Me, R′ = Ph, in Compound Pt1088: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1089: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1090: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1091: R= Ph, R′ = H, in Compound Pt1092: R = Ph, R′ = Me, in Compound Pt1093: R= Ph, R′ = ^(i)Pr, in Compound Pt1094: R = Ph, R′ = Ph, in CompoundPt1095: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1096: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1097: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1098 through Pt1111, eachrepresented by the formula

wherein in Compound Pt1098: R = Me, R′ = H, in Compound Pt1099: R = Me,R′ = Me, in Compound Pt1100: R = Me, R′ = ^(i)Pr, in Compound Pt1101: R= Me, R′ = Ph, in Compound Pt1102: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1103: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1104: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1105: R= Ph, R′ = H, in Compound Pt1106: R = Ph, R′ = Me, in Compound Pt1107: R= Ph, R′ = ^(i)Pr, in Compound Pt1108: R = Ph, R′ = Ph, in CompoundPt1109: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1110: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1111: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1112 through Pt1125, eachrepresented by the formula

wherein in Compound Pt1112: R = Me, R′ = H, in Compound Pt1113: R = Me,R′ = Me, in Compound Pt1114: R = Me, R′ = ^(i)Pr, in Compound Pt1115: R= Me, R′ = Ph, in Compound Pt1116: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1117: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1118: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1119: R= Ph, R′ = H, in Compound Pt1120: R = Ph, R′ = Me, in Compound Pt1121: R= Ph, R′ = ^(i)Pr, in Compound Pt1122: R = Ph, R′ = Ph, in CompoundPt1123: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph in Compound Pt1124: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1125: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1126 through Pt1139, eachrepresented by the formula

wherein in Compound Pt1126: R = Me, R′ = H, in Compound Pt1127: R = Me,R′ = Me, in Compound Pt1128: R = Me, R′ = ^(i)Pr, in Compound Pt1129: R= Me, R′ = Ph, in Compound Pt1130: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1131: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1132: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1133: R= Ph, R′ = H, in Compound Pt1134: R = Ph, R′ = Me, in Compound Pt1135: R= Ph, R′ = ^(i)Pr, in Compound Pt1136: R = Ph, R′ = Ph, in CompoundPt1137: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1138: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1139: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1140 through Pt1153, eachrepresented by the formula

wherein in Compound Pt1140: R = Me, R′ = H, in Compound Pt1141: R = Me,R′ = Me, in Compound Pt1142: R = Me, R′ = ^(i)Pr, in Compound Pt1143: R= Me, R′ = Ph, in Compound Pt1144: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1145: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1146: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1147: R= Ph, R′ = H, in Compound Pt1148: R = Ph, R′ = Me, in Compound Pt1149: R= Ph, R′ = ^(i)Pr, in Compound Pt1150: R = Ph, R′ = Ph, in CompoundPt1151: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1152: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1153: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1154 through Pt1167, eachrepresented by the formula

wherein in Compound Pt1154: R = Me, R′ = H, in Compound Pt1155: R = Me,R′ = Me, in Compound Pt1156: R = Me, R′ = ^(i)Pr, in Compound Pt1157: R= Me, R′ = Ph, in Compound Pt1158: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1159: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1160: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1161: R= Ph, R′ = H, in Compound Pt1162: R = Ph, R′ = Me, in Compound Pt1163: R= Ph, R′ = ^(i)Pr, in Compound Pt1164: R = Ph, R′ = Ph, in CompoundPt1165: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1166: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1167: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1168 through Pt1181, eachrepresented by the formula

wherein in Compound Pt1168: R = Me, R′ = H, in Compound Pt1169: R = Me,R′ = Me, in Compound Pt1170: R = Me, R′ = ^(i)Pr, in Compound Pt1171: R= Me, R′ = Ph, in Compound Pt1172: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1173: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1174: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1175: R= Ph, R′ = H, in Compound Pt1176: R = Ph, R′ = Me, in Compound Pt1177: R= Ph, R′ = ^(i)Pr, in Compound Pt1178: R = Ph, R′ = Ph, in CompoundPt1179: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1180: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1181: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1182 through Pt1195, eachrepresented by the formula

wherein in Compound Pt1182: R = Me, R′ = H, in Compound Pt1183: R = Me,R′ = Me, in Compound Pt1184: R = Me, R′ = ^(i)Pr, in Compound Pt1185: R= Me, R′ = Ph, in Compound Pt1186: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1187: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1188: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1189: R= Ph, R′ = H, in Compound Pt1190: R = Ph, R′ = Me, in Compound Pt1191: R= Ph, R′ = ^(i)Pr, in Compound Pt1192: R = Ph, R′ = Ph, in CompoundPt1193: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1194: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1195: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1196 through Pt1209, eachrepresented by the formula

wherein in Compound Pt1196: R = Me, R′ = H, in Compound Pt1197: R = Me,R′ = Me, in Compound Pt1198: R = Me, R′ = ^(i)Pr, in Compound Pt1199: R= Me, R′ = Ph, in Compound Pt1200: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1201: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1202: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1203: R= Ph, R′ = H, in Compound Pt1204: R = Ph, R′ = Me, in Compound Pt1205: R= Ph, R′ = ^(i)Pr, in Compound Pt1206: R = Ph, R′ = Ph, in CompoundPt1207: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1208: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1209: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1210 through Pt1223, eachrepresented by the formula

wherein in Compound Pt1210: R = Me, R′ = H, in Compound Pt1211: R = Me,R′ = Me, in Compound Pt1212: R = Me, R′ = ^(i)Pr, in Compound Pt1213: R= Me, R′ = Ph, in Compound Pt1214: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1215: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1216: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1217: R= Ph, R′ = H, in Compound Pt1218: R = Ph, R′ = Me, in Compound Pt1219: R= Ph, R′ = ^(i)Pr, in Compound Pt1220: R = Ph, R′ = Ph, in CompoundPt1221: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1222: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1223: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1224 through Pt1237, eachrepresented by the formula

wherein in Compound Pt1224: R = Me, R′ = H, in Compound Pt1225: R = Me,R′ = Me, in Compound Pt1226: R = Me, R′ = ^(i)Pr, in Compound Pt1227: R= Me, R′ = Ph, in Compound Pt1228: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1229: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1230: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1231: R= Ph, R′ = H, in Compound Pt1232: R = Ph, R′ = Me, in Compound Pt1233: R= Ph, R′ = ^(i)Pr, in Compound Pt1234: R = Ph, R′ = Ph, in CompoundPt1235: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1236: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1237: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1238 through Pt1251, eachrepresented by the formula

wherein in Compound Pt1238: R = Me, R′ = H, in Compound Pt1239: R = Me,R′ = Me, in Compound Pt1240: R = Me, R′ = ^(i)Pr, in Compound Pt1241: R= Me, R′ = Ph, in Compound Pt1242: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1243: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1244: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1245: R= Ph, R′ = H, in Compound Pt1246: R = Ph, R′ = Me, in Compound Pt1247: R= Ph, R′ = ^(i)Pr, in Compound Pt1248: R = Ph, R′ = Ph, in CompoundPt1249: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1250: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1251: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1252 through Pt1265, eachrepresented by the formula

wherein in Compound Pt1252: R = Me, R = H, in Compound Pt1253: R = Me,R′ = Me, in Compound Pt1254: R = Me, R′ = ^(i)Pr, in Compound Pt1255: R= Me, R′ = Ph, in Compound Pt1256: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1257: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1258: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1259: R= Ph, R′ = H, in Compound Pt1260: R = Ph, R′ = Me, in Compound Pt1261: R= Ph, R′ = ^(i)Pr, in Compound Pt1262: R = Ph, R′ = Ph, in CompoundPt1263: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1264: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1265: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1266 through Pt1279, eachrepresented by the formula

wherein in Compound Pt1266: R = Me, R′ = H, in Compound Pt1267: R = Me,R′ = Me, in Compound Pt1268: R = Me, R′ = ^(i)Pr, in Compound Pt1269: R= Me, R′ = Ph, in Compound Pt1270: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1271: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1272: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1273: R= Ph, R′ = H, in Compound Pt1274: R = Ph, R′ = Me, in Compound Pt1275: R= Ph, R′ = ^(i)Pr, in Compound Pt1276: R = Ph, R′ = Ph, in CompoundPt1277: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1278: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1279: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1280 through Pt1293, eachrepresented by the formula

wherein in Compount Pt1280: R = Me, R′ = H, in Compount Pt1281: R = Me,R′ = Me, in Compount Pt1282: R = Me, R′ = ^(i)Pr, in Compount Pt1283: R= Me, R′ = Ph, in Compount Pt1284: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompount Pt1285: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompountPt1286: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compount Pt1287: R= Ph, R′ = H, in Compount Pt1288: R = Ph, R′ = Me, in Compount Pt1289: R= Ph, R′ = ^(i)Pr, in Compount Pt1290: R = Ph, R′ = Ph, in CompountPt1291: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compount Pt1292: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compount Pt1293: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1294 through Pt1307, eachrepresented by the formula

wherein in Compount Pt1294: R = Me, R′ = H, in Compount Pt1295: R = Me,R′ = Me, in Compount Pt1296: R = Me, R′ = ^(i)Pr, in Compount Pt1297: R= Me, R′ = Ph, in Compount Pt1298: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompount Pt1299: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompountPt1300: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compount Pt1301: R= Ph, R′ = H, in Compount Pt1302: R = Ph, R′ = Me, in Compount Pt1303: R= Ph, R′ = ^(i)Pr, in Compount Pt1304: R = Ph, R′ = Ph, in CompountPt1305: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compount Pt1306: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compount Pt1307: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1308 through Pt1321, eachrepresented by the formula

wherein in Compound Pt1308: R = Me, R′ = H, in Compound Pt1309: R = Me,R′ = Me, in Compound Pt1310: R = Me, R′ = ^(i)Pr, in Compound Pt1311: R= Me, R′ = Ph, in Compound Pt1312: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1313: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1314: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1315: R= Ph, R′ = H, in Compound Pt1316: R = Ph, R′ = Me, in Compound Pt1317: R= Ph, R′ = ^(i)Pr, in Compound Pt1318: R = Ph, R′ = Ph, in CompoundPt1319: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1320: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1321: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1322 through Pt1335, eachrepresented by the formula

wherein in Compound Pt1322: R = Me, R′ = H, in Compound Pt1323: R = Me,R′ = Me, in Compound Pt1324: R = Me, R′ = ^(i)Pr, in Compound Pt1325: R= Me, R′ = Ph, in Compound Pt1326: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1327: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1328: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1329: R= Ph, R′ = H, in Compound Pt1330: R = Ph, R′ = Me, in Compound Pt1331: R= Ph, R′ = ^(i)Pr, in Compound Pt1332: R = Ph, R′ = Ph, in CompoundPt1333: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1334: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1335: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1336 through Pt1349, eachrepresented by the formula

wherein in Compound Pt1336: R = Me, R′ = H, in Compound Pt1337: R = Me,R′ = Me, in Compound Pt1338: R = Me, R′ = ^(i)Pr, in Compound Pt1339: R= Me, R′ = Ph, in Compound Pt1340: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1341: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1342: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1343: R= Ph, R′ = H, in Compound Pt1344: R = Ph, R′ = Me, in Compound Pt1345: R= Ph, R′ = ^(i)Pr, in Compound Pt1346: R = Ph, R′ = Ph, in CompoundPt1347: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1348: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1349: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1350 through Pt1363, eachrepresented by the formula

wherein in Compound Pt1350: R = Me, R′ = H, in Compound Pt1351: R = Me,R′ = Me, in Compound Pt1352: R = Me, R′ = ^(i)Pr, in Compound Pt1353: R= Me, R′ = Ph, in Compound Pt1354: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1355: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1356: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1357: R= Ph, R′ = H, in Compound Pt1358: R = Ph, R′ = Me, in Compound Pt1359: R= Ph, R′ = ^(i)Pr, in Compound Pt1360: R = Ph, R′ = Ph, in CompoundPt1361: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1362: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1363: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1364 through Pt1377, eachrepresented by the formula

wherein in Compound Pt1364: R = Me, R′ = H, in Compound Pt1365: R = Me,R′ = Me, in Compound Pt1366: R = Me, R′ = ^(i)Pr, in Compound Pt1367: R= Me, R′ = Ph, in Compound Pt1368: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1369: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1370: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1371: R= Ph, R′ = H, in Compound Pt1372: R = Ph, R′ = Me, in Compound Pt1373: R= Ph, R′ = ^(i)Pr, in Compound Pt1374: R = Ph, R′ = Ph, in CompoundPt1375: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1376: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1377: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1378 through Pt1391, eachrepresented by the formula

wherein in Compound Pt1378: R = Me, R′ = H, in Compound Pt1379: R = Me,R′ = Me, in Compound Pt1380: R = Me, R′ = ^(i)Pr, in Compound Pt1381: R= Me, R′ = Ph, in Compound Pt1382: R = Me, R = 2,6-(^(i)Pr)₂Ph, inCompound Pt1383: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1384: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1385: R= Ph, R′ = H, in Compound Pt1386: R = Ph, R′ = Me, in Compound Pt1387: R= Ph, R′ = ^(i)Pr, in Compound Pt1388: R = Ph, R′ = Ph, in CompoundPt1389: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1390: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1391: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1392 through Pt1405, eachrepresented by the formula

wherein in Compound Pt1392: R = Me, R′ = H in Compound Pt1393: R = Me,R′ = Me in Compound Pt1394: R = Me, R′ = ^(i)Pr in Compound Pt1395: R =Me, R = Ph in Compound Pt1396: R = Me, R′ = 2,6-(^(i)Pr)₂Ph in CompoundPt1397: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl in Compound Pt1398: R =Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran in Compound Pt1399: R = Ph, R′ = Hin Compound Pt1400: R = Ph, R′ = Me in Compound Pt1401: R = Ph, R′ =^(i)Pr in Compound Pt1402: R = Ph, R′ = Ph in Compound Pt1403: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph in Compound Pt1404: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl in Compound Pt1405: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt1406 through Pt1419, eachrepresented by the formula

wherein in Compound Pt1406: R = Me, R′ = H, in Compound Pt1407: R = Me,R′ = Me, in Compound Pt1408: R = Me, R′ = ^(i)Pr, in Compound Pt1409: R= Me, R′ = Ph, in Compound Pt1410: R = Me, R′ = 2,6-(^(i)Pr)₂Ph inCompound Pt1411: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1412: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1413: R= Ph, R′ = H, in Compound Pt1414: R = Ph, R′ = Me, in Compound Pt1415: R= Ph, R′ = ^(i)Pr, in Compound Pt1416: R = Ph, R′ = Ph, in CompoundPt1417: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph in Compound Pt1418: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1419: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1420 through Pt1433, eachrepresented by the formula

wherein in Compound Pt1420: R = Me, R′ = H, in Compound Pt1421: R = Me,R = Me, in Compound Pt1422: R = Me, R′ = ^(i)Pr, in Compound Pt1423: R =Me, R′ = Ph, in Compound Pt1424: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1425: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1426: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1427: R= Ph, R′ = H, in Compound Pt1428: R = Ph, R′ = Me, in Compound Pt1429: R= Ph, R′ = ^(i)Pr, in Compound Pt1430: R = Ph, R′ = Ph, in CompoundPt1431: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1432: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1433: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1434 through Pt1447, eachrepresented by the formula

wherein in Compound Pt1434: R = Me, R′ = H, in Compound Pt1435: R = Me,R′ = Me, in Compound Pt1436: R = Me, R′ = ^(i)Pr, in Compound Pt1437: R= Me, R′ = Ph, in Compound Pt1438: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1439: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1440: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1441: R= Ph, R′ = H, in Compound Pt1442: R = Ph, R′ = Me, in Compound Pt1443: R= Ph, R′ = ^(i)Pr, in Compound Pt1444: R = Ph, R′ = Ph, in CompoundPt1445: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1446: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1447: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1448 through Pt1461, eachrepresented by the formula

wherein in Compound Pt1448: R = Me, R′ = H, in Compound Pt1449: R = Me,R′ = Me, in Compound Pt1450: R = Me, R′ = ^(i)Pr, in Compound Pt1451: R= Me, R′ = Ph, in Compound Pt1452: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1453: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1454: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1455: R= Ph, R′ = H, in Compound Pt1456: R = Ph, R′ = Me, in Compound Pt1457: R= Ph, R′ = ^(i)Pr, in Compound Pt1458: R = Ph, R′ = Ph, in CompoundPt1459: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1460: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1461: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1462 through Pt1475, eachrepresented by the formula

wherein in Compound Pt1462: R = Me, R′ = H, in Compound Pt1463: R = Me,R′ = Me, in Compound Pt1464: R = Me, R′ = ^(i)Pr, in Compound Pt1465: R= Me, R′ = Ph, in Compound Pt1466: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1467: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1468: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1469: R= Ph, R′ = H, in Compound Pt1470: R = Ph, R′ = Me, in Compound Pt1471: R= Ph, R′ = ^(i)Pr, in Compound Pt1472: R = Ph, R′ = Ph, in CompoundPt1473: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1474: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1475: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1476 through Pt1489, eachrepresented by the formula

wherein in Compound Pt1476: R = Me, R = H, in Compound Pt1477: R = Me,R′ = Me, in Compound Pt1478: R = Me, R′ = ^(i)Pr, in Compound Pt1479: R= Me, R′ = Ph, in Compound Pt1480: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1481: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1482: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1483: R= Ph, R′ = H, in Compound Pt1484: R = Ph, R′ = Me, in Compound Pt1485: R= Ph, R′ = ^(i)Pr, in Compound Pt1486: R = Ph, R′ = Ph, in CompoundPt1487: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1488: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1489: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1490 through Pt1503, eachrepresented by the formula

wherein in Compound Pt1490: R = Me, R′ = H, in Compound Pt1491: R = Me,R′ = Me, in Compound Pt1492: R = Me, R′ = ^(i)Pr, in Compound Pt1493: R= Me, R′ = Ph, in Compound Pt1494: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1495: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1496: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1497: R= Ph, R′ = H, in Compound Pt1498: R = Ph, R′ = Me, in Compound Pt1499: R= Ph, R′ = ^(i)Pr, in Compound Pt1500: R = Ph, R′ = Ph, in CompoundPt1501: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1502: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1503: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1504 through Pt1517, eachrepresented by the formula

wherein in Compound Pt1504: R = Me, R′ = H, in Compound Pt1505: R = Me,R′ = Me, in Compound Pt1506: R = Me, R′ = ^(i)Pr, in Compound Pt1507: R= Me, R′ = Ph, in Compound Pt1508: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1509: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1510: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1511: R= Ph, R′ = H, in Compound Pt1512: R = Ph, R′ = Me, in Compound Pt1513: R= Ph, R′ = ^(i)Pr, in Compound Pt1514: R = Ph, R′ = Ph, in CompoundPt1515: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1516: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1517: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1518 through Pt1531, eachrepresented by the formula

wherein in Compound Pt1518: R = Me, R′ = H, in Compound Pt1519: R = Me,R′ = Me, in Compound Pt1520: R = Me, R′ = ^(i)Pr, in Compound Pt1521: R= Me, R′ = Ph, in Compound Pt1522: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1523: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1524: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1525: R= Ph, R′ = H, in Compound Pt1526: R = Ph, R′ = Me, in Compound Pt1527: R= Ph, R′ = ^(i)Pr, in Compound Pt1528: R = Ph, R′ = Ph, in CompoundPt1529: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1530: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1531: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1532 through Pt1545, eachrepresented by the formula

wherein in Compound Pt1532: R = Me, R′ = H, in Compound Pt1533: R = Me,R′ = Me, in Compound Pt1534: R = Me, R′ = ^(i)Pr, in Compound Pt1535: R= Me, R′ = Ph, in Compound Pt1536: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1537: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1538: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1539: R= Ph, R′ = H, in Compound Pt1540: R = Ph, R′ = Me, in Compound Pt1541: R= Ph, R′ = ^(i)Pr, in Compound Pt1542: R = Ph, R′ = Ph, in CompoundPt1543: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1544: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1545: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1546 through Pt1559, eachrepresented by the formula

wherein in Compound Pt1546: R = Me, R′ = H, in Compound Pt1547: R = Me,R′ = Me, in Compound Pt1548: R = Me, R′ = ^(i)Pr, in Compound Pt1549: R= Me, R′ = Ph, in Compound Pt1550: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1551: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1552: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1553: R= Ph, R′ = H, in Compound Pt1554: R = Ph, R′ = Me, in Compound Pt1555: R= Ph, R′ = ^(i)Pr, in Compound Pt1556: R = Ph, R′ = Ph, in CompoundPt1557: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1558: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1559: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound Pt1560 through Pt1573, eachrepresented by the formula

wherein in Compound Pt1560: R = Me, R′ = H, Compound Pt1561: R = Me, R′= Me, in Compound Pt1562: R = Me, R′ = ^(i)Pr, in Compound Pt1563: R =Me, R′ = Ph, in Compound Pt1564: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1565: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1566: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1567: R= Ph, R′ = H, in Compound Pt1568:R = Ph, R′ = Me, in Compound Pt1569: R= Ph, R′ = ^(i)Pr, in Compound Pt1570: R = Ph, R′ = Ph, in CompoundPt1571: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1572: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1573: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1574 through Pt1587, eachrepresented by the formula

wherein in Compound Pt1574: R = Me, R′ = H, in Compound Pt1575: R = Me,R′ = Me, in Compound Pt1576: R = Me, R′ = ^(i)Pr, in Compound Pt1577: R= Me, R′ = Ph, in Compound Pt1578: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1579: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1580: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1581: R= Ph, R′ = H, in Compound Pt1582: R = Ph, R′ = Me, in Compound Pt1583: R= Ph, R′ = ^(i)Pr, in Compound Pt1584: R = Ph, R′ = Ph, in CompoundPt1585: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1586: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1587: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1588 through Pt1601, eachrepresented by the formula

wherein in Compound Pt1588: R = Me, R′ = H, in Compound Pt1589: R = Me,R′ = Me, in Compound Pt1590: R = Me, R′ = ^(i)Pr, in Compound Pt1591: R= Me, R′ = Ph, in Compound Pt1592: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1593: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1594: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1595: R= Ph, R′ = H, in Compound Pt1596: R = Ph, R′ = Me, in Compound Pt1597: R= Ph, R′ = ^(i)Pr, in Compound Pt1598: R = Ph, R′ = Ph, in CompoundPt1599: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1600: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1601: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1602 through Pt1615, eachrepresented by the formula

wherein in Compound Pt1602: R = Me, R′ = H, in Compound Pt1603: R = Me,R′ = Me, in Compound Pt1604: R = Me, R′ = ^(i)Pr, in Compound Pt1605: R= Me, R′ = Ph, in Compound Pt1606: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1607: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1608: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1609: R= Ph, R′ = H, in Compound Pt1610: R = Ph, R′ = Me, in Compound Pt1611: R= Ph, R′ = ^(i)Pr, in Compound Pt1612: R = Ph, R′ = Ph, in CompoundPt1613: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1614: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1615: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1616 through Pt1629, eachrepresented by the formula

wherein in Compound Pt1616: R = Me, R′ = H, in Compound Pt1617: R = Me,R′ = Me, in Compound Pt1618: R = Me, R′ = ^(i)Pr, in Compound Pt1619: R= Me, R′ = Ph, in Compound Pt1620: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1621: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1622: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1623: R= Ph, R′ = H, in Compound Pt1624: R = Ph, R′ = Me, in Compound Pt1625: R= Ph, R′ = ^(i)Pr, in Compound Pt1626: R = Ph, R′ = Ph, in CompoundPt1627: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1628: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1629: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1630 through Pt1643, eachrepresented by the formula

wherein in Compound Pt1630: R = Me, R′ = H, in Compound Pt1631: R = Me,R′ = Me, in Compound Pt1632: R = Me, R′ = ^(i)Pr, in Compound Pt1633: R= Me, R′ = Ph, in Compound Pt1634: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1635: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1636: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1637: R= Ph, R′ = H, in Compound Pt1638: R = Ph, R′ = Me, in Compound Pt1639: R= Ph, R′ = ^(i)Pr, in Compound Pt1640: R = Ph, R′ = Ph, in CompoundPt1641: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1642: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1643: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1644 through Pt1657, eachrepresented by the formula

wherein in Compound Pt1644: R = Me, R′ = H, in Compound Pt1645: R = Me,R′ = Me, in Compound Pt1646: R = Me, R′ = ^(i)Pr, in Compound Pt1647: R= Me, R′ = Ph, in Compound Pt1648: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1649: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1650: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1651: R= Ph, R′ = H, in Compound Pt1652: R = Ph, R′ = Me, in Compound Pt1653: R= Ph, R′ = ^(i)Pr, in Compound Pt1654: R = Ph, R′ = Ph, in CompoundPt1655: R = Ph, R = 2,6-(^(i)Pr)₂Ph, in Compound Pt1656: R = Ph, R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1657: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1658 through Pt1671, eachrepresented by the formula

wherein in Compound Pt1658: R = Me, R′ = H, in Compound Pt1659: R = Me,R′ = Me, in Compound Pt1660: R = Me, R′ = ^(i)Pr, in Compound Pt1661: R= Me, R′ = Ph, in Compound Pt1662: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1663: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1664: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1665: R= Ph, R′ = H, in Compound Pt1666: R = Ph, R′ = Me, in Compound Pt1667: R= Ph, R′ = ^(i)Pr, in Compound Pt1668: R = Ph, R′ = Ph, in CompoundPt1669: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1670: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1671: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1672 through Pt1685, eachrepresented by the formula

wherein in Compound Pt1672: R = Me, R′ = H, in Compound Pt1673: R = Me,R′ = Me, in Compound Pt1674: R = Me, R′ = ^(i)Pr, in Compound Pt1675: R= Me, R′ = Ph, in Compound Pt1676: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1677: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1678: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1679: R= Ph, R′ = H, in Compound Pt1680: R = Ph, R′ = Me, in Compound Pt1681: R= Ph, R′ = ^(i)Pr, in Compound Pt1682: R = Ph, R′ = Ph, in CompoundPt1683: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1684: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1685: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1686 through Pt1699, eachrepresented by the formula

wherein in Compound Pt1686: R = Me, R′ = H, in Compound Pt1687: R = Me,R′ = Me, in Compound Pt1688: R = Me, R′ = ^(i)Pr, in Compound Pt1689: R= Me, R′ = Ph, in Compound Pt1690: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1691: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1692: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1693: R= Ph, R′ = H, in Compound Pt1694: R = Ph, R′ = Me, in Compound Pt1695: R= Ph, R′ = ^(i)Pr, in Compound Pt1696: R = Ph, R′ = Ph, in CompoundPt1697: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1698: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1699: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1700 through Pt1713, eachrepresented by the formula

wherein in Compound Pt1700: R = Me, R′ = H, in Compound Pt1701: R = Me,R′ = Me, in Compound Pt1702: R = Me, R′ = ^(i)Pr, in Compound Pt1703: R= Me, R′ = Ph, in Compound Pt1704: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1705: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1706: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1707: R= Ph, R′ = H, in Compound Pt1708: R = Ph, R′ = Me, in Compound Pt1709: R= Ph, R′ = ^(i)Pr, in Compound Pt1710: R = Ph, R′ = Ph, in CompoundPt1711: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1712: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1713: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1714 through Pt1727, eachrepresented by the formula

wherein in Compound Pt1714: R = Me, R′ = H, in Compound Pt1715: R = Me,R′ = Me, in Compound Pt1716: R = Me, R′ = ^(i)Pr, in Compound Pt1717: R= Me, R′ = Ph, in Compound Pt1718: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1719: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1720: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1721: R= Ph, R′ = H, in Compound Pt1722: R = Ph, R′ = Me, in Compound Pt1723: R= Ph, R′ = ^(i)Pr, in Compound Pt1724: R = Ph, R′ = Ph, in CompoundPt1725: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1726: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1727: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1728 through Pt1741, eachrepresented by the formula

wherein in Compound Pt1728: R = Me, R′ = H, in Compound Pt1729: R = Me,R′ = Me, in Compound Pt1730: R = Me, R′ = ^(i)Pr, in Compound Pt1731: R= Me, R′ = Ph, in Compound Pt1732: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1733: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1734: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1735: R= Ph, R′ = H, in Compound Pt1736: R = Ph, R′ = Me, in Compound Pt1737: R= Ph, R′ = ^(i)Pr, in Compound Pt1738: R = Ph, R′ = Ph, in CompoundPt1739: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1740: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1741: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1742 through Pt1755, eachrepresented by the formula

wherein in Compound Pt1742: R = Me, R′ = H, in Compound Pt1743: R = Me,R′ = Me, in Compound Pt1744: R = Me, R′ = ^(i)Pr, in Compound Pt1745: R= Me, R′ = Ph, in Compound Pt1746: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1747: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1748: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1749: R= Ph, R′ = H, in Compound Pt1750: R = Ph, R′ = Me, in Compound Pt1751: R= Ph, R′ = ^(i)Pr, in Compound Pt1752: R = Ph, R′ = Ph, in CompoundPt1753: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1754: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1755: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1756 through Pt1769, eachrepresented by the formula

wherein in Compound Pt1756: R = Me, R′ = H, in Compound Pt1757: R = Me,R′ = Me, in Compound Pt1758: R = Me, R′ = ^(i)Pr, in Compound Pt1759: R= Me, R′ = Ph, in Compound Pt1760: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1761: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1762: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1763: R= Ph, R′ = H, in Compound Pt1764: R = Ph, R′ = Me, in Compound Pt1765: R= Ph, R′ = ^(i)Pr, in Compound Pt1766: R = Ph, R′ = Ph, in CompoundPt1767: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1768: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1769: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1770 through Pt1783, eachrepresented by the formula

wherein in Compound Pt1770: R = Me, R′ = H, in Compound Pt1771: R = Me,R′ = Me, in Compound Pt1772: R = Me, R′ = ^(i)Pr, in Compound Pt1773: R= Me, R′ = Ph, in Compound Pt1774: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1775: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1776: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1777: R= Ph, R′ = H, in Compound Pt1778: R = Ph, R′ = Me, in Compound Pt1779: R= Ph, R′ = ^(i)Pr, in Compound Pt1780: R = Ph, R′ = Ph, in CompoundPt1781: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1782: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1783: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1784 through Pt1797, eachrepresented by the formula

wherein in Compound Pt1784: R = Me, R′ = H, in Compound Pt1785: R = Me,R′ = Me, in Compound Pt1786: R = Me, R′ = ^(i)Pr, in Compound Pt1787: R= Me, R′ = Ph, in Compound Pt1788: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1789: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1790: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1791: R= Ph, R′ = H, in Compound Pt1792: R = Ph, R′ = Me, in Compound Pt1793: R= Ph, R′ = ^(i)Pr, in Compound Pt1794: R = Ph, R′ = Ph, in CompoundPt1795: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1796: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1797: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1798 through Pt1811, eachrepresented by the formula

wherein in Compound Pt1798: R = Me, R′ = H, in Compound Pt1799: R = Me,R′ = Me, in Compound Pt1800: R = Me, R′ = ^(i)Pr, in Compound Pt1801: R= Me, R′ = Ph, in Compound Pt1802: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1803: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1804: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1805: R= Ph, R′ = H, in Compound Pt1806: R = Ph, R′ = Me, in Compound Pt1807: R= Ph, R′ = ^(i)Pr, in Compound Pt1808: R = Ph, R′ = Ph, in CompoundPt1809: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1810: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1811: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1812 through Pt1825, eachrepresented by the formula

wherein in Compound Pt1812: R = Me, R′ = H, in Compound Pt1813: R = Me,R′ = Me, in Compound Pt1814: R = Me, R′ = ^(i)Pr, in Compound Pt1815: R= Me, R′ = Ph, in Compound Pt1816: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1817: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1818: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1819: R= Ph, R′ = H, in Compound Pt1820: R = Ph, R′ = Me, in Compound Pt1821: R= Ph, R′ = ^(i)Pr, in Compound Pt1822: R = Ph, R′ = Ph, in CompoundPt1823: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1824: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1825: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1826 through Pt1839, eachrepresented by the formula

wherein in Compound Pt1826: R = Me, R′ = H, in Compound Pt1827: R = Me,R′ = Me, in Compound Pt1828: R = Me, R′ = ^(i)Pr, in Compound Pt1829: R= Me, R′ = Ph, in Compound Pt1830: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1831: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1832: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1833: R= Ph, R′ = H, in Compound Pt1834: R = Ph, R′ = Me, in Compound Pt1835: R= Ph, R′ = ^(i)Pr, in Compound Pt1836: R = Ph, R′ = Ph, in CompoundPt1837: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1838: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1839: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1840 through Pt1853, eachrepresented by the formula

wherein in Compound Pt1840: R = Me, R′ = H, in Compound Pt1841: R = Me,R′ = Me, in Compound Pt1842: R = Me, R′ = ^(i)Pr, in Compound Pt1843: R= Me, R′ = Ph, in Compound Pt1844: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1845: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1846: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1847: R= Ph, R′ = H, in Compound Pt1848: R = Ph, R′ = Me, in Compound Pt1849: R= Ph, R′ = ^(i)Pr, in Compound Pt1850: R = Ph, R′ = Ph, in CompoundPt1851: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1852: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1853: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1854 through Pt1867, eachrepresented by the formula

wherein in Compound Pt1854: R = Me, R′ = H, in Compound Pt1855: R = Me,R′ = Me, in Compound Pt1856: R = Me, R′ = ^(i)Pr, in Compound Pt1857: R= Me, R′ = Ph, in Compound Pt1858: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1859: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1860: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1861: R= Ph, R′ = H, in Compound Pt1862: R = Ph, R′ = Me, in Compound Pt1863: R= Ph, R′ = ^(i)Pr, in Compound Pt1864: R = Ph, R′ = Ph, in CompoundPt1865: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1866: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1867: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1868 through Pt1881, eachrepresented by the formula

wherein in Compound Pt1868: R = Me, R′ = H, in Compound Pt1869: R = Me,R′ = Me, in Compound Pt1870: R = Me, R′ = ^(i)Pr, in Compound Pt1871: R= Me, R′ = Ph, in Compound Pt1872: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1873: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1874: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1875: R= Ph, R′ = H, in Compound Pt1876: R = Ph, R′ = Me, in Compound Pt1877: R= Ph, R′ = ^(i)Pr, in Compound Pt1878: R = Ph, R′ = Ph, in CompoundPt1879: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1880: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1881: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1882 through Pt1895, eachrepresented by the formula

wherein in Compound Pt1882: R = Me, R′ = H, in Compound Pt1883: R = Me,R′ = Me, in Compound Pt1884: R = Me, R′ = ^(i)Pr, in Compound Pt1885: R= Me, R′ = Ph, in Compound Pt1886: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1887: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1888: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1889: R= Ph, R′ = H, in Compound Pt1890: R = Ph, R′ = Me, in Compound Pt1891: R= Ph, R′ = ^(i)Pr, in Compound Pt1892: R = Ph, R′ = Ph, in CompoundPt1893: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1894: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1895: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1896 through Pt1909, eachrepresented by the formula

wherein in Compound Pt1896: R = Me, R′ = H, in Compound Pt1897: R = Me,R′ = Me, in Compound Pt1898: R = Me, R′ = ^(i)Pr, in Compound Pt1899: R= Me, R′ = Ph, in Compound Pt1900: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1901: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1902: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1903: R= Ph, R′ = H, in Compound Pt1904: R = Ph, R′ = Me, in Compound Pt1905: R= Ph, R′ = ^(i)Pr, in Compound Pt1906: R = Ph, R′ = Ph, in CompoundPt1907: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1908: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1909: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1910 through Pt1923, eachrepresented by the formula

wherein in Compound Pt1910: R = Me, R′ = H, in Compound Pt1911: R = Me,R′ = Me, in Compound Pt1912: R = Me, R′ = ^(i)Pr, in Compound Pt1913: R= Me, R′ = Ph, in Compound Pt1914: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1915: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1916: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuren, in Compound Pt1917: R= Ph, R′ = H, in Compound Pt1918: R = Ph, R′ = Me, in Compound Pt1919: R= Ph, R′ = ^(i)Pr, in Compound Pt1920: R = Ph, R′ = Ph, in CompoundPt1921: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1922: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1923: R = ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1924 through Pt1937, eachrepresented by the formula

wherein in Compound Pt1924: R = Me, R′ = H, in Compound Pt1925: R = Me,R′ = Me, in Compound Pt1926: R = Me, R′ = ^(i)Pr, in Compound Pt1927: R= Me, R′ = Ph, in Compound Pt1928: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1929: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1930: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1931: R= Ph, R′ = H, in Compound Pt1932: R = Ph, R′ = Me, in Compound Pt1933: R= Ph, R′ = ^(i)Pr, in Compound Pt1934: R = Ph, R′ = Ph, in CompoundPt1935: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1936: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1937: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1938 through Pt1951, eachrepresented by the formula

wherein in Compound Pt1938: R = Me, R′ = H, in Compound Pt1939: R = Me,R′ = Me, in Compound Pt1940: R = Me, R′ = ^(i)Pr, in Compound Pt1941: R= Me, R′ = Ph, in Compound Pt1942: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1943: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1944: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1945: R= Ph, R′ = H, in Compound Pt1946: R = Ph, R′ = Me, in Compound Pt1947: R= Ph, R′ = ^(i)Pr, in Compound Pt1948: R = Ph, R′ = Ph, in CompoundPt1949: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1950: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1951: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1952 through Pt1965, eachrepresented by the formula

wherein in Compound Pt1952: R = Me, R′ = H, in Compound Pt1953: R = Me,R′ = Me, in Compound Pt1954: R = Me, R′ = ^(i)Pr, in Compound Pt1955: R= Me, R′ = Ph, in Compound Pt1956: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1957: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1958: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1959: R= Ph, R′ = H, in Compound Pt1960: R = Ph, R′ = Me, in Compound Pt1961: R= Ph, R′ = ^(i)Pr, in Compound Pt1962: R = Ph, R′ = Ph, in CompoundPt1963: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1964: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1965: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1966 through Pt1979, eachrepresented by the formula

wherein in Compound Pt1966: R = Me, R′ = H, in Compound Pt1967: R = Me,R′ = Me, in Compound Pt1968: R = Me, R′ = ^(i)Pr, in Compound Pt1969: R= Me, R′ = Ph, in Compound Pt1970: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1971: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1972: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1973: R= Ph, R′ = H, in Compound Pt1974: R = Ph, R′ = Me, in Compound Pt1975: R= Ph, R′ = ^(i)Pr, in Compound Pt1976: R = Ph, R′ = Ph, in CompoundPt1977: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1978: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1979: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1980 through Pt1993, eachrepresented by the formula

wherein in Compound Pt1980: R = Me, R′ = H, in Compound Pt1981: R = Me,R′ = Me, in Compound Pt1982: R = Me, R′ = ^(i)Pr, in Compound Pt1983: R= Me, R′ = Ph, in Compound Pt1984: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1985: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt1986: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt1987: R= Ph, R′ = H, in Compound Pt1988: R = Ph, R′ = Me, in Compound Pt1989: R= Ph, R′ = ^(i)Pr, in Compound Pt1990: R = Ph, R′ = Ph, in CompoundPt1991: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt1992: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt1993: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt1994 through Pt2007, eachrepresented by the formula

wherein in Compound Pt1994: R = Me, R′ = H, in Compound Pt1995: R = Me,R′ = Me, in Compound Pt1996: R = Me, R′ = ^(i)Pr, in Compound Pt1997: R= Me, R′ = Ph, in Compound Pt1998: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt1999: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2000: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2001: R= Ph, R′ = H, in Compound Pt2002: R = Ph, R′ = Me, in Compound Pt2003: R= Ph, R′ = ^(i)Pr, in Compound Pt2004: R = Ph, R′ = Ph, in CompoundPt2005: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2006: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2007: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2008 through Pt2021, eachrepresented by the formula

wherein in Compound Pt2008: R = Me, R′ = H, in Compound Pt2009: R = Me,R′ = Me, in Compound Pt2010: R = Me, R′ = ^(i)Pr, in Compound Pt2011: R= Me, R′ = Ph, in Compound Pt2012: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2013: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2014: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2015: R= Ph, R′ = H, in Compound Pt2016: R = Ph, R′ = Me, in Compound Pt2017: R= Ph, R′ = ^(i)Pr, in Compound Pt2018: R = Ph, R′ = Ph, in CompoundPt2019: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2020: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2021: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2022 through Pt2035, eachrepresented by the formula

wherein in Compound Pt2022: R = Me, R′ = H, in Compound Pt2023: R = Me,R′ = Me, in Compound Pt2024: R = Me, R′ = ^(i)Pr, in Compound Pt2025: R= Me, R′ = Ph, in Compound Pt2026: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2027: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2028: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2029: R= Ph, R′ = H, in Compound Pt2030: R = Ph, R′ = Me, in Compound Pt2031: R= Ph, R′ = ^(i)Pr, in Compound Pt2032: R = Ph, R′ = Ph, in CompoundPt2033: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2034: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2035: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2036 through Pt2049, eachrepresented by the formula

wherein in Compound Pt2036: R = Me, R′ = H, in Compound Pt2037: R = Me,R′ = Me, in Compound Pt2038: R = Me, R′ = ^(i)Pr, in Compound Pt2039: R= Me, R′ = Ph, in Compound Pt2040: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2041: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2042: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2043: R= Ph, R′ = H, in Compound Pt2044: R = Ph, R′ = Me, in Compound Pt2045: R= Ph, R′ = ^(i)Pr, in Compound Pt2046: R = Ph, R′ = Ph, in CompoundPt2047: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2048: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2049: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2050 through Pt2063, eachrepresented by the formula

wherein in Compound Pt2050: R = Me, R′ = H, in Compound Pt2051: R = Me,R′ = Me, in Compound Pt2052: R = Me, R′ = ^(i)Pr, in Compound Pt2053: R= Me, R′ = Ph, in Compound Pt2054: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2055: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2056: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2057: R= Ph, R′ = H, in Compound Pt2058: R = Ph, R′ = Me, in Compound Pt2059: R= Ph, R′ = ^(i)Pr, in Compound Pt2060: R = Ph, R′ = Ph, in CompoundPt2061: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2062: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2063: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2064 through Pt2077, eachrepresented by the formula

wherein in Compound Pt2064: R = Me, R′ = H, in Compound Pt2065: R = Me,R′ = Me, in Compound Pt2066: R = Me, R′ = ^(i)Pr, in Compound Pt2067: R= Me, R′ = Ph, in Compound Pt2068: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2069: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2070: R = Me, R′ = 2,4-(^(i)Pr)₂-3-dibenzofuran, in Compound Pt2071: R= Ph, R′ = H, in Compound Pt2072: R = Ph, R′ = Me, in Compound Pt2073: R= Ph, R′ = ^(i)Pr, in Compound Pt2074: R = Ph, R′ = Ph, in CompoundPt2075: R = Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2076: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2077: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Pt2078 through Pt2091, eachrepresented by the formula

wherein in Compound Pt2078: R = Me, R′ = H, in Compound Pt2079: R = Me,R′ = Me, in Compound Pt2080: R = Me, R′ = ^(i)Pr, in Compound Pt2081: R= Me, R′ = Ph, in Compound Pt2082: R = Me, R′ = 2,6-(^(i)Pr)₂Ph, inCompound Pt2083: R = Me, R′ = 2,6-(^(i)Pr)₂-4-biphenyl, in CompoundPt2084: R = Me, R′ = 2,4-002-3-dibenzofuran, in Compound Pt2085: R = Ph,R′ = H, in Compound Pt2086: R = Ph, R′ = Me, in Compound Pt2087: R = Ph,R′ = ^(i)Pr, in Compound Pt2088: R = Ph, R′ = Ph, in Compound Pt2089: R= Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound Pt2090: R = Ph, R′ =2,6-(^(i)Pr)₂-4-biphenyl, in Compound Pt2091: R = Ph, R′ =2,4-(^(i)Pr)₂-3-dibenzofuran, , and

In some embodiments, M is Ir. In some embodiments, the compound isheteroleptic. In some embodiments, the compound is homoleptic.

In some embodiments, L_(B) is different from L_(A), and L_(B) isselected from the group consisting of:

In some embodiments, in the structure of L_(B):

each of X¹ to X¹³ is independently selected from the group consisting ofcarbon and nitrogen;

X is selected from the group consisting of BR′, NR′, PR′, O, S, Se, C═O,S═O, SO₂, CR′R″, SiR′R″, and GeR′R″;

R′ and R″ are optionally joined to form a fused or unfused ring;

each R_(a), R_(b), R_(c), and R_(d) may represent from mono substitutionto the possible maximum number of substitution, or no substitution;

R′, R″, R_(a), R_(b), R_(c), and R_(d) are each independently selectedfrom the group consisting of hydrogen, deuterium, halide, alkyl,cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl,alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl,carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl,sulfinyl, sulfonyl, phosphino, and combinations thereof; and

any two adjacent substituents of R_(a), R_(b), R_(c), and R_(d) areoptionally joined to form a fused or unfused ring or form a multidentateligand.

In some embodiments, the compound is selected from the group consistingof:

Compound Ir14 through Ir26, each represented by the formula

wherein in Compound Ir14: R = Me, in Compound Ir15: R = Et, in CompoundIr16: R = ^(i)Pr, in Compound Ir17: R = Cy, in Compound Ir18: R =^(i)Bu, in Compound Ir19: R = ^(t)Bu, in Compound Ir20: R = CN, inCompound Ir21: R = neopentyl, in Compound Ir22: R = Ph, in CompoundIr23: R = 4-biphenyl, in Compound Ir24: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr25: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir26: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir27 through Ir39, eachrepresented by the formula

wherein in Compound Ir27: R = Me, in Compound Ir28: R = Et, in CompoundIr29: R = ^(i)Pr, in Compound Ir30: R = Cy, in Compound Ir31: R =^(i)Bu, in Compound Ir32: R = ^(t)Bu, in Compound Ir33: R = CN, inCompound Ir34: R = neopentyl, in Compound Ir35: R = Ph, in CompoundIr36: R = 4-biphenyl, in Compound Ir37: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr38: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir39: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir40 through Ir52, eachrepresented by the formula

wherein in Compound Ir40: R = Me, in Compound Ir41: R = Et, in CompoundIr42: R = ^(i)Pr, in Compound Ir43: R = Cy, in Compound Ir44: R =^(i)Bu, in Compound Ir45: R = ^(t)Bu, in Compound Ir46: R = CN, inCompound Ir47: R = neopentyl, in Compound Ir48: R = Ph, in CompoundIr49: R = 4-biphenyl, in Compound Ir50: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr51: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir52: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir53 through Ir65, eachrepresented by the formula

wherein in Compound Ir53: R = Me, in Compound Ir54: R = Et, in CompoundIr55: R = ^(i)Pr, in Compound Ir56: R = Cy, in Compound Ir57: R =^(i)Bu, in Compound Ir58: R = ^(t)Bu, in Compound Ir59: R = CN, inCompound Ir60: R = neopentyl, in Compound Ir61: R = Ph, in CompoundIr62: R = 4-biphenyl, in Compound Ir63: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr64: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir65: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir66 through Ir78, eachrepresented by the formula

wherein in Compound Ir66: R = Me, in Compound Ir67: R = Et, in CompoundIr68: R = ^(i)Pr, in Compound Ir69: R = Cy, in Compound Ir70: R =^(i)Bu, in Compound Ir71: R = ^(t)Bu, in Compound Ir72: R = CN, inCompound Ir73: R = neopentyl, in Compound Ir74: R = Ph, in CompoundIr75: R = 4-biphenyl, in Compound Ir76: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr77: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir78: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir79 through Ir91, eachrepresented by the formula

wherein in Compound Ir79: R = Me, in Compound Ir80: R = Et, in CompoundIr81: R = ^(i)Pr, in Compound Ir82: R = Cy, in Compound Ir83: R =^(i)Bu, in Compound Ir84: R = ^(t)Bu, in Compound Ir85: R = CN, inCompound Ir86: R = neopentyl, in Compound Ir87: R = Ph, in CompoundIr88: R = 4-biphenyl, in Compound Ir89: R = 2,6-(^(i)Pr)₂Ph, in CompoundIr90: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir91: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir92 through Ir104, eachrepresented by the formula

wherein in Compound Ir92: R = Me, in Compound Ir93: R = Et, in CompoundIr94: R = ^(i)Pr, in Compound Ir95: R = Cy, in Compound Ir96: R =^(i)Bu, in Compound Ir97: R = ^(t)Bu, in Compound Ir98: R = CN, inCompound Ir99: R = neopentyl, in Compound Ir100: R = Ph, in CompoundIr101: R = 4-biphenyl, in Compound Ir102: R = 2,6-(^(i)Pr)₂Ph, inCompound Ir103: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir104: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir105 through Ir117, eachrepresented by the formula

wherein in Compound Ir105: R = Me, in Compound Ir106: R = Et, inCompound Ir107: R = ^(i)Pr, in Compound Ir108: R = Cy, in CompoundIr109: R = ^(i)Bu, in Compound Ir110: R = ^(t)Bu, in Compound Ir111: R =CN, in Compound Ir112: R = neopentyl, in Compound Ir113: R = Ph, inCompound Ir114: R = 4-biphenyl, in Compound Ir115: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir116: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir117: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir118 through Ir130, eachrepresented by the formula

wherein in Compound Ir118: R = Me, in Compound Ir119: R = Et, inCompound Ir120: R = ^(i)Pr, in Compound Ir121: R = Cy, in CompoundIr122: R = ^(i)Bu, in Compound Ir123: R = ^(t)Bu, in Compound Ir124: R =CN, in Compound Ir125: R = neopentyl, in Compound Ir126: R = Ph, inCompound Ir127: R = 4-biphenyl, in Compound Ir128: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir129: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir130: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir131 through Ir143, eachrepresented by the formula

wherein in Compound Ir131: R = Me, in Compound Ir132: R = Et, inCompound Ir133: R = ^(i)Pr, in Compound Ir134: R = Cy, in CompoundIr135: R = ^(i)Bu, in Compound Ir136: R = ^(t)Bu, in Compound Ir137: R =CN, in Compound Ir138: R = neopentyl, in Compound Ir139: R = Ph, inCompound Ir140: R = 4-biphenyl, in Compound Ir141: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir142: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir143: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir144 through Ir156, eachrepresented by the formula

wherein in Compound Ir144: R = Me, in Compound Ir145: R = Et, inCompound Ir146: R = ^(i)Pr, in Compound Ir147: R = Cy, in CompoundIr148: R = ^(i)Bu, in Compound Ir149: R = ^(t)Bu, in Compound Ir150: R =CN, in Compound Ir151: R = neopentyl, in Compound Ir152: R = Ph, inCompound Ir153: R = 4-biphenyl, in Compound Ir154: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir155: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir156: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir157 through Ir169, eachrepresented by the formula

wherein in Compound Ir157: R = Me, in Compound Ir158: R = Et, inCompound Ir159: R = ^(i)Pr, in Compound Ir160: R = Cy, in CompoundIr161: R = ^(i)Bu, in Compound Ir162: R = ^(t)Bu, in Compound Ir163: R =CN, in Compound Ir164: R = neopentyl, in Compound Ir165: R = Ph, inCompound Ir166: R = 4-biphenyl, in Compound Ir167: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir168: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir169: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir170 through Ir182, eachrepresented by the formula

wherein in Compound Ir170: R = Me, in Compound Ir171: R = Et, inCompound Ir172: R = ^(i)Pr, in Compound Ir173: R = Cy, in CompoundIr174: R = ^(i)Bu, in Compound Ir175: R = ^(t)Bu, in Compound Ir176: R =CN, in Compound Ir177: R = neopentyl, in Compound Ir178: R = Ph, inCompound Ir179: R = 4-biphenyl, in Compound Ir180: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir181: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir182: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir183 through Ir195, eachrepresented by the formula

wherein in Compound Ir183: R = Me, in Compound Ir184: R = Et, inCompound Ir185: R = ^(i)Pr, in Compound Ir186: R = Cy, in CompoundIr187: R = ^(i)Bu, in Compound Ir188: R = ^(t)Bu, in Compound Ir189: R =CN, in Compound Ir190: R = neopentyl, in Compound Ir191: R = Ph, inCompound Ir192: R = 4-biphenyl, in Compound Ir193: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir194: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir195: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir196 through Ir208, eachrepresented by the formula

wherein in Compound Ir196: R = Me, in Compound Ir197: R = Et, inCompound Ir198: R = ^(i)Pr, in Compound Ir199: R = Cy, in CompoundIr200: R = ^(i)Bu, in Compound Ir201: R = ^(t)Bu, in Compound Ir202: R =CN, in Compound Ir203: R = neopentyl, in Compound Ir204: R = Ph, inCompound Ir205: R = 4-biphenyl, in Compound Ir206: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir207: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir208: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir209 through Ir221, eachrepresented by the formula

wherein in Compound Ir209: R = Me, in Compound Ir210: R = Et, inCompound Ir211: R = ^(i)Pr, in Compound Ir212: R = Cy, in CompoundIr213: R = ^(i)Bu, in Compound Ir214: R = ^(t)Bu, in Compound Ir215: R =CN, in Compound Ir216: R = neopentyl, in Compound Ir217: R = Ph, inCompound Ir218: R = 4-biphenyl, in Compound Ir219: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir220: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir221: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir222 through Ir234, eachrepresented by the formula

wherein in Compound Ir222: R = Me, in Compound Ir223: R = Et, inCompound Ir224: R = ^(i)Pr, in Compound Ir225: R = Cy, in CompoundIr226: R = ^(i)Bu, in Compound Ir227: R = ^(t)Bu, in Compound Ir228: R =CN, in Compound Ir229: R = neopentyl, in Compound Ir230: R = Ph, inCompound Ir231: R = 4-biphenyl, in Compound Ir232: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir233: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir234: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir235 through Ir247, eachrepresented by the formula

wherein in Compound Ir235: R = Me, in Compound Ir236: R = Et, inCompound Ir237: R = ^(i)Pr, in Compound Ir238: R = Cy, in CompoundIr239: R = ^(i)Bu, in Compound Ir240: R = ^(t)Bu, in Compound Ir241: R =CN, in Compound Ir242: R = neopentyl, in Compound Ir243: R = Ph, inCompound Ir244: R = 4-biphenyl, in Compound Ir245: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir246: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir247: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir248 through Ir260, eachrepresented by the formula

wherein in Compound Ir248: R = Me, in Compound Ir249: R = Et, inCompound Ir250: R = ^(i)Pr, in Compound Ir251: R = Cy, in CompoundIr252: R = ^(i)Bu, in Compound Ir253: R = ^(t)Bu, in Compound Ir254: R =CN, in Compound Ir255: R = neopentyl, in Compound Ir256: R = Ph, inCompound Ir257: R = 4-biphenyl, in Compound Ir258: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir259: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir260: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir261 through Ir273, eachrepresented by the formula

wherein in Compound Ir261: R = Me, in Compound Ir262: R = Et, inCompound Ir263: R = ^(i)Pr, in Compound Ir264: R = Cy, in CompoundIr265: R = ^(i)Bu, in Compound Ir266: R = ^(t)Bu, in Compound Ir267: R =CN, in Compound Ir268: R = neopentyl, in Compound Ir269: R = Ph, inCompound Ir270: R = 4-biphenyl, in Compound Ir271: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir272: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir273: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir274 through Ir286, eachrepresented by the formula

wherein in Compound Ir274: R = Me, in Compound Ir275: R = Et, inCompound Ir276: R = ^(i)Pr, in Compound Ir277: R = Cy, in CompoundIr278: R = ^(i)Bu, in Compound Ir279: R = ^(t)Bu, in Compound Ir280: R =CN, in Compound Ir281: R = neopentyl, in Compound Ir282: R = Ph, inCompound Ir283: R = 4-biphenyl, in Compound Ir284: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir285: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir286: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir287 through Ir299, eachrepresented by the formula

wherein in Compound Ir287: R = Me, in Compound Ir288: R = Et, inCompound Ir289: R = ^(i)Pr, in Compound Ir290: R = Cy, in CompoundIr291: R = ^(i)Bu, in Compound Ir292: R = ^(t)Bu, in Compound Ir293: R =CN, in Compound Ir294: R = neopentyl, in Compound Ir295: R = Ph, inCompound Ir296: R = 4-biphenyl, in Compound Ir297: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir298: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir299: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir300 through Ir312, eachrepresented by the formula

wherein in Compound Ir300: R = Me, in Compound Ir301: R = Et, inCompound Ir302: R = ^(i)Pr, in Compound Ir303: R = Cy, in CompoundIr304: R = ^(i)Bu, in Compound Ir305: R = ^(t)Bu, in Compound Ir306: R =CN, in Compound Ir307: R = neopentyl, in Compound Ir308: R = Ph, inCompound Ir309: R = 4-biphenyl, in Compound Ir310: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir311: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir312: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir313 through Ir325, eachrepresented by the formula

wherein in Compound Ir313: R = Me, in Compound Ir314: R = Et, inCompound Ir315: R = ^(i)Pr, in Compound Ir316: R = Cy, in CompoundIr317: R = ^(i)Bu, in Compound Ir318: R = ^(t)Bu, in Compound Ir319: R =CN, in Compound Ir320: R = neopentyl, in Compound Ir321: R = Ph, inCompound Ir322: R = 4-biphenyl, in Compound Ir323: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir324: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir325: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir326 through Ir338, eachrepresented by the formula

wherein in Compound Ir326: R = Me, in Compound Ir327: R = Et, inCompound Ir328: R = ^(i)Pr, in Compound Ir329: R = Cy, in CompoundIr330: R = ^(i)Bu, in Compound Ir331: R = ^(t)Bu, in Compound Ir332: R =CN, in Compound Ir333: R = neopentyl, in Compound Ir334: R = Ph, inCompound Ir335: R = 4-biphenyl, in Compound Ir336: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir337: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir338: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir339 through Ir351, eachrepresented by the formula

wherein in Compound Ir339: R = Me, in Compound Ir340: R = Et, inCompound Ir341: R = ^(i)Pr, in Compound Ir342: R = Cy, in CompoundIr343: R = ^(i)Bu, in Compound Ir344: R = ^(t)Bu, in Compound Ir345: R =CN, in Compound Ir346: R = neopentyl, in Compound Ir347: R = Ph, inCompound Ir348: R = 4-biphenyl, in Compound Ir349: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir350: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir351: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir352 through Ir364, eachrepresented by the formula

wherein in Compound Ir352: R = Me, in Compound Ir353: R = Et, inCompound Ir354: R = ^(i)Pr, in Compound Ir355: R = Cy, in CompoundIr356: R = ^(i)Bu, in Compound Ir357: R = ^(t)Bu, in Compound Ir358: R =CN, in Compound Ir359: R = neopentyl, in Compound Ir360: R = Ph, inCompound Ir361: R = 4-biphenyl, in Compound Ir362: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir363: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir364: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir365 through Ir377, eachrepresented by the formula

wherein in Compound Ir365: R = Me, in Compound Ir366: R = Et, inCompound Ir367: R = ^(i)Pr, in Compound Ir368: R = Cy, in CompoundIr369: R = ^(i)Bu, in Compound Ir370: R = ^(t)Bu, in Compound Ir371: R =CN, in Compound Ir372: R = neopentyl, in Compound Ir373: R = Ph, inCompound Ir374: R = 4-biphenyl, in Compound Ir375: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir376: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir377: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir378 through Ir390, eachrepresented by the formula

wherein in Compound Ir378: R = Me, in Compound Ir379: R = Et, inCompound Ir380: R = ^(i)Pr, in Compound Ir381: R = Cy, in CompoundIr382: R = ^(i)Bu, in Compound Ir383: R = ^(t)Bu, in Compound Ir384: R =CN, in Compound Ir385: R = neopentyl, in Compound Ir386: R = Ph, inCompound Ir387: R = 4-biphenyl, in Compound Ir388: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir389: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir390: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir391 through Ir403, eachrepresented by the formula

wherein in Compound Ir391: R = Me, in Compound Ir392: R = Et, inCompound Ir393: R = ^(i)Pr, in Compound Ir394: R = Cy, in CompoundIr395: R = ^(i)Bu, in Compound Ir396: R = ^(t)Bu, in Compound Ir397: R =CN, in Compound Ir398: R = neopentyl, in Compound Ir399: R = Ph, inCompound Ir400: R = 4-biphenyl, in Compound Ir401: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir402: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir403: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir404 through Ir416, eachrepresented by the formula

wherein in Compound Ir404: R = Me, in Compound Ir405: R = Et, inCompound Ir406: R = ^(i)Pr, in Compound Ir407: R = Cy, in CompoundIr408: R = ^(i)Bu, in Compound Ir409: R = ^(t)Bu, in Compound Ir410: R =CN, in Compound Ir411: R = neopentyl, in Compound Ir412: R = Ph, inCompound Ir413: R = 4-biphenyl, in Compound Ir414: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir415: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir416: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir417 through Ir429, eachrepresented by the formula

wherein in Compound Ir417: R = Me, in Compound Ir418: R = Et, inCompound Ir419: R = ^(i)Pr, in Compound Ir420: R = Cy, in CompoundIr421: R = ^(i)Bu, in Compound Ir422: R = ^(t)Bu, in Compound Ir423: R =CN, in Compound Ir424: R = neopentyl, in Compound Ir425: R = Ph, inCompound Ir426: R = 4-biphenyl, in Compound Ir427: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir428: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir429: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir430 through Ir442, eachrepresented by the formula

wherein in Compound Ir430: R = Me, in Compound Ir431: R = Et, inCompound Ir432: R = ^(i)Pr, in Compound Ir433: R = Cy, in CompoundIr434: R = ^(i)Bu, in Compound Ir435: R = ^(t)Bu, in Compound Ir436: R =CN, in Compound Ir437: R = neopentyl, in Compound Ir438: R = Ph, inCompound Ir439: R = 4-biphenyl, in Compound Ir440: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir441: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir442: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir443 through Ir455, eachrepresented by the formula

wherein in Compound Ir443: R = Me, in Compound Ir444: R = Et, inCompound Ir445: R = ^(i)Pr, in Compound Ir446: R = Cy, in CompoundIr447: R = ^(i)Bu, in Compound Ir448: R = ^(t)Bu, in Compound Ir449: R =CN, in Compound Ir450: R = neopentyl, in Compound Ir451: R = Ph, inCompound Ir452: R = 4-biphenyl, in Compound Ir453: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir454: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir455: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir456 through Ir468, eachrepresented by the formula

wherein in Compound Ir456: R = Me, in Compound Ir457: R = Et, inCompound Ir458: R = ^(i)Pr, in Compound Ir459: R = Cy, in CompoundIr460: R = ^(i)Bu, in Compound Ir461: R = ^(t)Bu, in Compound Ir462: R =CN, in Compound Ir463: R = neopentyl, in Compound Ir464: R = Ph, inCompound Ir465: R = 4-biphenyl, in Compound Ir466: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir467: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir468: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir469 through Ir481, eachrepresented by the formula

wherein in Compound Ir469: R = Me, in Compound Ir470: R = Et, inCompound Ir471: R = ^(i)Pr, in Compound Ir472: R = Cy, in CompoundIr473: R = ^(i)Bu, in Compound Ir474: R = ^(t)Bu, in Compound Ir475: R =CN, in Compound Ir476: R = neopentyl, in Compound Ir477: R = Ph, inCompound Ir478: R = 4-biphenyl, in Compound Ir479: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir480: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir481: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir482 through Ir494, eachrepresented by the formula

wherein in Compound Ir482: R = Me, in Compound Ir483: R = Et, inCompound Ir484: R = ^(i)Pr, in Compound Ir485: R = Cy, in CompoundIr486: R = ^(i)Bu, in Compound Ir487: R = ^(t)Bu, in Compound Ir488: R =CN, in Compound Ir489: R = neopentyl, in Compound Ir490: R = Ph, inCompound Ir491: R = 4-biphenyl, in Compound Ir492: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir493: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir494: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir495 through Ir507, eachrepresented by the formula

wherein in Compound Ir495: R = Me, in Compound Ir496: R = Et, inCompound Ir497: R = ^(i)Pr, in Compound Ir498: R = Cy, in CompoundIr499: R = ^(i)Bu, in Compound Ir500: R = ^(t)Bu, in Compound Ir501: R =CN, in Compound Ir502: R = neopentyl, in Compound Ir503: R = Ph, inCompound Ir504: R = 4-biphenyl, in Compound Ir505: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir506: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir507: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir508 through Ir520, eachrepresented by the formula

wherein in Compound Ir508: R = Me, in Compound Ir509: R = Et, inCompound Ir510: R = ^(i)Pr, in Compound Ir511: R = Cy, in CompoundIr512: R = ^(i)Bu, in Compound Ir513: R = ^(t)Bu, in Compound Ir514: R =CN, in Compound Ir515: R = neopentyl, in Compound Ir516: R = Ph, inCompound Ir517: R = 4-biphenyl, in Compound Ir518: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir519: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir520: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir521 through Ir533, eachrepresented by the formula

wherein in Compound Ir521: R = Me, in Compound Ir522: R = Et, inCompound Ir523: R = ^(i)Pr, in Compound Ir524: R = Cy, in CompoundIr525: R = ^(i)Bu, in Compound Ir526: R = ^(t)Bu, in Compound Ir527: R =CN, in Compound Ir528: R = neopentyl, in Compound Ir529: R = Ph, inCompound Ir530: R = 4-biphenyl, in Compound Ir531: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir532: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir533: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir534 through Ir546, eachrepresented by the formula

wherein in Compound Ir534: R = Me, in Compound Ir535: R = Et, inCompound Ir536: R = ^(i)Pr, in Compound Ir537: R = Cy, in CompoundIr538: R = ^(i)Bu, in Compound Ir539: R = ^(t)Bu, in Compound Ir540: R =CN, in Compound Ir541: R = neopentyl, in Compound Ir542: R = Ph, inCompound Ir543: R = 4-biphenyl, in Compound Ir544: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir545: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir546: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir547 through Ir559, eachrepresented by the formula

wherein in Compound Ir547: R = Me, in Compound Ir548: R = Et, inCompound Ir549: R = ^(i)Pr, in Compound Ir550: R = Cy, in CompoundIr551: R = ^(i)Bu, in Compound Ir552: R = ^(t)Bu, in Compound Ir553: R =CN, in Compound Ir554: R = neopentyl, in Compound Ir555: R = Ph, inCompound Ir556: R = 4-biphenyl, in Compound Ir557: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir558: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir559: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir560 through Ir572, eachrepresented by the formula

wherein in Compound Ir560: R = Me, in Compound Ir561: R = Et, inCompound Ir562: R = ^(i)Pr, in Compound Ir563: R = Cy, in CompoundIr564: R = ^(i)Bu, in Compound Ir565: R = ^(t)Bu, in Compound Ir566: R =CN, in Compound Ir567: R = neopentyl, in Compound Ir568: R = Ph, inCompound Ir569: R = 4-biphenyl, in Compound Ir570: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir571: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir572: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir573 through Ir585, eachrepresented by the formula

wherein in Compound Ir573: R = Me, in Compound Ir574: R = Et, inCompound Ir575: R = ^(i)Pr, in Compound Ir576: R = Cy, in CompoundIr577: R = ^(i)Bu, in Compound Ir578: R = ^(t)Bu, in Compound Ir579: R =CN, in Compound Ir580: R = neopentyl, in Compound Ir581: R = Ph, inCompound Ir582: R = 4-biphenyl, in Compound Ir583: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir584: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir585: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir586 through Ir598, eachrepresented by the formula

wherein in Compound Ir586: R = Me, in Compound Ir587: R = Et, inCompound Ir588: R = ^(i)Pr, in Compound Ir589: R = Cy, in CompoundIr590: R = ^(i)Bu, in Compound Ir591: R = ^(t)Bu, in Compound Ir592: R =CN, in Compound Ir593: R = neopentyl, in Compound Ir594: R = Ph, inCompound Ir595: R = 4-biphenyl, in Compound Ir596: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir597: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir598: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir599 through Ir611, eachrepresented by the formula

wherein in Compound Ir599: R = Me, in Compound Ir600: R = Et, inCompound Ir601: R = ^(i)Pr, in Compound Ir602: R = Cy, in CompoundIr603: R = ^(i)Bu, in Compound Ir604: R = ^(t)Bu, in Compound Ir605: R =CN, in Compound Ir606: R = neopentyl, in Compound Ir607: R = Ph, inCompound Ir608: R = 4-biphenyl, in Compound Ir609: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir610: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir611: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir612 through Ir624, eachrepresented by the formula

wherein in Compound Ir612: R = Me, in Compound Ir613: R = Et, inCompound Ir614: R = ^(i)Pr, in Compound Ir615: R = Cy, in CompoundIr616: R = ^(i)Bu, in Compound Ir617: R = ^(t)Bu, in Compound Ir618: R =CN, in Compound Ir619: R = neopentyl, in Compound Ir620: R = Ph, inCompound Ir621: R = 4-biphenyl, in Compound Ir622: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir623: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir624: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir625 through Ir637, eachrepresented by the formula

wherein in Compound Ir625: R = Me, in Compound Ir626: R = Et, inCompound Ir627: R = ^(i)Pr, in Compound Ir628: R = Cy, in CompoundIr629: R = ^(i)Bu, in Compound Ir630: R = ^(t)Bu, in Compound Ir631: R =CN, in Compound Ir632: R = neopentyl, in Compound Ir633: R = Ph, inCompound Ir634: R = 4-biphenyl, in Compound Ir635: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir636: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir637: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir638 through Ir650, eachrepresented by the formula

wherein in Compound Ir638: R = Me, in Compound Ir639: R = Et, inCompound Ir640: R = ^(i)Pr, in Compound Ir641: R = Cy, in CompoundIr642: R = ^(i)Bu, in Compound Ir643: R = ^(t)Bu, in Compound Ir644: R =CN, in Compound Ir645: R = neopentyl, in Compound Ir646: R = Ph, inCompound Ir647: R = 4-biphenyl, in Compound Ir648: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir649: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir650: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir651 through Ir663, eachrepresented by the formula

wherein in Compound Ir651: R = Me, in Compound Ir652: R = Et, inCompound Ir653: R = ^(i)Pr, in Compound Ir654: R = Cy, in CompoundIr655: R = ^(i)Bu, in Compound Ir656: R = ^(t)Bu, in Compound Ir657: R =CN, in Compound Ir658: R = neopentyl, in Compound Ir659: R = Ph, inCompound Ir660: R = 4-biphenyl, in Compound Ir661: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir662: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir663: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir664 through Ir676, eachrepresented by the formula

wherein in Compound Ir664: R = Me, in Compound Ir665: R = Et, inCompound Ir666: R = ^(i)Pr, in Compound Ir667: R = Cy, in CompoundIr668: R = ^(i)Bu, in Compound Ir669: R = ^(t)Bu, in Compound Ir670: R =CN, in Compound Ir671: R = neopentyl, in Compound Ir672: R = Ph, inCompound Ir673: R = 4-biphenyl, in Compound Ir674: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir675: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir676: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir677 through Ir689, eachrepresented by the formula

wherein in Compound Ir677: R = Me, in Compound Ir678: R = Et, inCompound Ir679: R = ^(i)Pr, in Compound Ir680: R = Cy, in CompoundIr681: R = ^(i)Bu, in Compound Ir682: R = ^(t)Bu, in Compound Ir683: R =CN, in Compound Ir684: R = neopentyl, in Compound Ir685: R = Ph, inCompound Ir686: R = 4-biphenyl, in Compound Ir687: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir688: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir689: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir690 through Ir702, eachrepresented by the formula

wherein in Compound Ir690: R = Me, in Compound Ir691: R = Et, inCompound Ir692: R = ^(i)Pr, in Compound Ir693: R = Cy, in CompoundIr694: R = ^(i)Bu, in Compound Ir695: R = ^(t)Bu, in Compound Ir696: R =CN, in Compound Ir697: R = neopentyl, in Compound Ir698: R = Ph, inCompound Ir699: R = 4-biphenyl, in Compound Ir700: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir701: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir702: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir703 through Ir715, eachrepresented by the formula

wherein in Compound Ir703: R = Me, in Compound Ir704: R = Et, inCompound Ir705: R = ^(i)Pr, in Compound Ir706: R = Cy, in CompoundIr707: R = ^(i)Bu, in Compound Ir708: R = ^(t)Bu, in Compound Ir709: R =CN, in Compound Ir710: R = neopentyl, in Compound Ir711: R = Ph, inCompound Ir712: R = 4-biphenyl, in Compound Ir713: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir714: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir715: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir716 through Ir728, eachrepresented by the formula

wherein in Compound Ir716: R = Me, in Compound Ir717: R = Et, inCompound Ir718: R = ^(i)Pr, in Compound Ir719: R = Cy, in CompoundIr720: R = ^(i)Bu, in Compound Ir721: R = ^(t)Bu, in Compound Ir722: R =CN, in Compound Ir723: R = neopentyl, in Compound Ir724: R = Ph, inCompound Ir725: R = 4-biphenyl, in Compound Ir726: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir727: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir728: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir729 through Ir741, eachrepresented by the formula

wherein in Compound Ir729: R = Me, in Compound Ir730: R = Et, inCompound Ir731: R = ^(i)Pr, in Compound Ir732: R = Cy, in CompoundIr733: R = ^(i)Bu, in Compound Ir734: R = ^(t)Bu, in Compound Ir735: R =CN, in Compound Ir736: R = neopentyl, in Compound Ir737: R = Ph, inCompound Ir738: R = 4-biphenyl, in Compound Ir739: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir740: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir741: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir742 through Ir754, eachrepresented by the formula

wherein in Compound Ir742: R = Me, in Compound Ir743: R = Et, inCompound Ir744: R = ^(i)Pr, in Compound Ir745: R = Cy, in CompoundIr746: R = ^(i)Bu, in Compound Ir747: R = ^(t)Bu, in Compound Ir748: R =CN, in Compound Ir749: R = neopentyl, in Compound Ir750: R = Ph, inCompound Ir751: R = 4-biphenyl, in Compound Ir752: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir753: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir754: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir755 through Ir767, eachrepresented by the formula

wherein in Compound Ir755: R = Me, in Compound Ir756: R = Et, inCompound Ir757: R = ^(i)Pr, in Compound Ir758: R = Cy, in CompoundIr759: R = ^(i)Bu, in Compound Ir760: R = ^(t)Bu, in Compound Ir761: R =CN, in Compound Ir762: R = neopentyl, in Compound Ir763: R = Ph, inCompound Ir764: R = 4-biphenyl, in Compound Ir765: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir766: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir767: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir768 through Ir780, eachrepresented by the formula

wherein in Compound Ir768: R = Me, in Compound Ir769: R = Et, inCompound Ir770: R = ^(i)Pr, in Compound Ir771: R = Cy, in CompoundIr772: R = ^(i)Bu, in Compound Ir773: R = ^(t)Bu, in Compound Ir774: R =CN, in Compound Ir775: R = neopentyl, in Compound Ir776: R = Ph, inCompound Ir777: R = 4-biphenyl, in Compound Ir778: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir779: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir780: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir781 through Ir793, eachrepresented by the formula

wherein in Compound Ir781: R = Me, in Compound Ir782: R = Et, inCompound Ir783: R = ^(i)Pr, in Compound Ir784: R = Cy, in CompoundIr785: R = ^(i)Bu, in Compound Ir786: R = ^(t)Bu, in Compound Ir787: R =CN, in Compound Ir788: R = neopentyl, in Compound Ir789: R = Ph, inCompound Ir790: R = 4-biphenyl, in Compound Ir791: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir792: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir793: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir794 through Ir806, eachrepresented by the formula

wherein in Compound Ir794: R = Me, in Compound Ir795: R = Et, inCompound Ir796: R = ^(i)Pr, in Compound Ir797 R = Cy, in Compound Ir798:R = ^(i)Bu, in Compound Ir799: R = ^(t)Bu, in Compound Ir800: R = CN, inCompound Ir801: R = neopentyl, in Compound Ir802: R = Ph, in CompoundIr803: R = 4-biphenyl, in Compound Ir804: R = 2,6-(^(i)Pr)₂Ph, inCompound Ir805: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir806: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir807 through Ir819, eachrepresented by the formula

wherein in Compound Ir807: R = Me, in Compound Ir808: R = Et, inCompound Ir809: R = ^(i)Pr, in Compound Ir810: R = Cy, in CompoundIr811: R = ^(i)Bu, in Compound Ir812: R = ^(t)Bu, in Compound Ir813: R =CN, in Compound Ir814: R = neopentyl, in Compound Ir815: R = Ph, inCompound Ir816: R = 4-biphenyl, in Compound Ir817: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir818: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir819: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir820 through Ir832, eachrepresented by the formula

wherein in Compound Ir820: R = Me, in Compound Ir821: R = Et, inCompound Ir822: R = ^(i)Pr, in Compound Ir823: R = Cy, in CompoundIr824: R = ^(i)Bu, in Compound Ir825: R = ^(t)Bu, in Compound Ir826: R =CN, in Compound Ir827: R = neopentyl, in Compound Ir828: R = Ph, inCompound Ir829: R = 4-biphenyl, in Compound Ir830: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir831: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir832: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir833 through Ir845, eachrepresented by the formula

wherein in Compound Ir833: R = Me, in Compound Ir834: R = Et, inCompound Ir835: R = ^(i)Pr, in Compound Ir836: R = Cy, in CompoundIr837: R = ^(i)Bu, in Compound Ir838: R = ^(t)Bu, in Compound Ir839: R =CN, in Compound Ir840: R = neopentyl, in Compound Ir841: R = Ph, inCompound Ir842: R = 4-biphenyl, in Compound Ir843: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir844: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir845: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir846 through Ir858, eachrepresented by the formula

wherein in Compound Ir846: R = Me, in Compound Ir847: R = Et, inCompound Ir848: R = ^(i)Pr, in Compound Ir849: R = Cy, in CompoundIr850: R = ^(i)Bu, in Compound Ir851: R = ^(t)Bu, in Compound Ir852: R =CN, in Compound Ir853: R = neopentyl, in Compound Ir854: R = Ph, inCompound Ir855: R = 4-biphenyl, in Compound Ir856: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir857: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir858: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir859 through Ir871, eachrepresented by the formula

wherein in Compound Ir859: R = Me, in Compound Ir860: R = Et, inCompound Ir861: R = ^(i)Pr, in Compound Ir862: R = Cy, in CompoundIr863: R = ^(i)Bu, in Compound Ir864: R = ^(t)Bu, in Compound Ir865: R =CN, in Compound Ir866: R = neopentyl, in Compound Ir867: R = Ph, inCompound Ir868: R = 4-biphenyl, in Compound Ir869: R = 2,6-(^(i)Pr)₂Ph,in Compound Ir870: R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound Ir871: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound Ir872 through Ir873, eachrepresented by the formula

wherein in Compound Ir872: R = H, in Compound Ir873: R = Ph, , CompoundIr874 through Ir875, each represented by the formula

wherein in Compound Ir874: R = H, in Compound Ir875: R = Ph, , CompoundIr876 through Ir887, each represented by the formula

wherein in Compound Ir876: R = H, R′ = 2,6-(^(i)Pr)Ph, R″ = H, inCompound Ir877: R = H, R′ = 2,6-(^(i)Bu)Ph, R″ = H, in Compound Ir878: R= H, R′ = Cy, R″ = H, in Compound Ir879: R = Ph, R′ = 2,6-(^(i)Pr)Ph, R″= H, in Compound Ir880: R = Ph, R′ = 2,6-(^(i)Bu)Ph, R″ = H, in CompoundIr881: R = Ph, R′ = Cy, R″ = H, in Compound Ir882: R = H, R′ =2,6-(^(i)Pr)Ph, R″ = Me, in Compound Ir883: R = H, R′ = 2,6-(^(i)Bu)Ph,R″ = Me, in Compound Ir884: R = H, R′ = Cy, R″ = Me, in Compound Ir885:R = Ph, R′ = 2,6-(^(i)Pr)Ph, R″ = Me, in Compound Ir886: R = Ph, R′ =2,6-(^(i)Bu)Ph, R″ = Me, in Compound Ir887: R = Ph, R′ = Cy, R″ = Me, ,Compound Ir888 through Ir889, each represented by the formula

wherein in Compound Ir888: R = H, in Compound Ir889: R = Ph, , CompoundIr890 through Ir891, each represented by the formula

wherein in Compound Ir890: R = H, in Compound Ir891: R = Ph, , CompoundIr892 through Ir895, each represented by the formula

wherein in Compound Ir892: R = H, R′ = Me, in Compound Ir893: R = H, R′= Ph, in Compound Ir894: R = Ph, R′ = Me, in Compound Ir895: R = Ph, R′= Ph, , Compound Ir896 through Ir899, each represented by the formula

wherein in Compound Ir896: R = H, R′ = Me, in Compound Ir897: R = H, R′= ^(i)Pr, in Compound Ir898: R = Ph, R′ = Me, in Compound Ir899: R = Ph,R′ = ^(i)Pr, , Compound Ir900 through Ir903, each represented by theformula

wherein in Compound Ir900: R = H, R′ = Me, in Compound Ir901: R = H, R′= ^(i)Pr, in Compound Ir902: R = Ph, R′ = Me, in Compound Ir903: R = Ph,R′ = ^(i)Pr, , and Compound Ir904 through Ir907, each represented by theformula

wherein in Compound Ir904: R = H, R′ = Me, in Compound Ir905: R = H, R′= ^(i)Pr, in Compound Ir906: R = Ph, R′ = Me, in Compound Ir907: R = Ph,R′ = ^(i)Pr, .

According to another aspect of the present disclosure, a compound havingthe structure of Formula III,

is disclosed. In the structure of Formula III:

-   -   R¹¹, and R¹² each independently represent mono, or di        substitution, or no substitution;    -   R¹³ and R¹⁴ each independently represent mono, di, tri, or tetra        substitution, or no substitution;    -   L¹¹ represents a linking group selected from the group        consisting of alkyl, cycloalkyl, aryl, and heteroaryl;    -   L¹² represents a linking group selected from the group        consisting of NR¹⁵, and PR¹⁵;    -   R₁₁, R₁₂, R¹³, R₁₄, and R¹⁵ are each independently selected from        the group consisting of hydrogen, deuterium, halide, alkyl,        cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino,        silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,        heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,        isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and        combinations thereof; and    -   any adjacent L¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are        optionally joined to form a fused or unfused ring.

In some embodiments, L¹¹ comprises two different atoms, each one bondedto a different pyrazole, and L¹² comprises one atom bonded to bothphenyl rings.

In some embodiments, L¹¹ has the structure selected from the groupconsisting of:

In such embodiments, R¹⁶, R¹⁷, R¹⁸, R¹⁹, R²⁰, and R²¹ are eachindependently selected from the group consisting of hydrogen, deuterium,halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinationsthereof; and any adjacent R¹⁶, R¹⁷, R¹⁸, R¹⁹, R²⁰, and R²¹ areoptionally joined to form a fused or unfused ring.

In some embodiments, L¹¹ is selected from the group consisting of:

In some embodiments, L¹¹ is selected from the group consisting of:

In some embodiments, L¹² is NR¹⁵. In some embodiments, L¹² is selectedfrom the group consisting of:

In some embodiments, at least one pair of adjacent L¹¹, L¹², R¹¹, R¹²,R¹³, R¹⁴, and R¹⁵ are joined or fused into a ring.

In some embodiments, the compound has the structure of Formula VI,

In some embodiments, R²² represents mono, di, tri, tetra, or pentasubstitution, or no substitution; R¹⁶, R¹⁷, R¹⁸, R¹⁹, and R²² are eachindependently selected from the group consisting of hydrogen, deuterium,halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinationsthereof; and any adjacent R¹⁶, R¹⁷, R¹⁸, R¹⁹ and R²² are optionallyjoined to form a fused or unfused ring.

In some embodiments, the compound has the structure of Formula V,

In some more specific embodiments, the compound is selected from thegroup

Compound PtM1 through PtM12, each represented by the formula

wherein in Compound PtM1: R = H, in Compound PtM2: R = Me, in CompoundPtM3: R = Et, in Compound PtM4: R = ^(i)Pr, in Compound PtM5: R =neopentyl, in Compound PtM6: R = ^(i)Bu, in Compound PtM7: R = ^(t)Bu,in Compound PtM8: R = Ph, in Compound PtM9: R = 4-biphenyl, in CompoundPtM10: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM11: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM12: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , consisting of: Compound PtM13 throughPtM21, each represented by the formula

wherein in Compound PtM13: R = Me, in Compound PtM14: R = Et, inCompound PtM15: R = ^(i)Pr, in Compound PtM16: R = neopentyl, inCompound PtM17: R = ^(i)Bu, in Compound PtM18: R = ^(t)Bu, in CompoundPtM19: R = Ph, in Compound PtM20: R = 2,6-(Me)₂Ph, in Compound PtM21: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM22 through PtM30, each represented bythe formula

wherein in Compound PtM22: R = Me, in Compound PtM23: R = Et, inCompound PtM24: R = ^(i)Pr, in Compound PtM25: R = neopentyl, inCompound PtM26: R = ^(i)Bu, in Compound PtM27: R = ^(t)Bu, in CompoundPtM28: R = Ph, in Compound PtM29: R = 2,6-(Me)₂Ph, in Compound PtM30: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM31 through PtM42, each represented bythe formula

wherein in Compound PtM31: R = H, in Compound PtM32: R = Me, in CompoundPtM33: R = Et, in Compound PtM34: R = ^(i)Pr, in Compound PtM35: R =neopentyl, in Compound PtM36: R = ^(i)Bu, in Compound PtM37: R = ^(t)Bu,in Compound PtM38: R = Ph, in Compound PtM39: R = 4-biphenyl, inCompound PtM40: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM41: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM42: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM43 through PtM51, eachrepresented by the formula

wherein in Compound PtM43: R = Me, in Compound PtM44: R = Et, inCompound PtM45: R = ^(i)Pr, in Compound PtM46: R = neopentyl, inCompound PtM47: R = ^(i)Bu, in Compound PtM48: R = ^(t)Bu, in CompoundPtM49: R = Ph, in Compound PtM50: R = 2,6-(Me)₂Ph, in Compound PtM51: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM52 through PtM60, each represented bythe formula

wherein in Compound PtM52: R = Me, in Compound PtM53: R = Et, inCompound PtM54: R = ^(i)Pr, in Compound PtM55: R = neopentyl, inCompound PtM56: R = ^(i)Bu, in Compound PtM57: R = ^(t)Bu, in CompoundPtM58: R = Ph, in Compound PtM59: R = 2,6-(Me)₂Ph, in Compound PtM60: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM61 through PtM72, each represented bythe formula

wherein in Compound PtM61: R = H, in Compound PtM62: R = Me, in CompoundPtM63: R = Et, in Compound PtM64: R = ^(i)Pr, in Compound PtM65: R =neopentyl, in Compound PtM66: R = ^(i)Bu, in Compound PtM67: R = ^(t)Bu,in Compound PtM68: R = Ph, in Compound PtM69: R = 4-biphenyl, inCompound PtM70: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM71: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM72: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM73 through PtM81, eachrepresented by the formula

wherein in Compound PtM73: R = Me, in Compound PtM74: R = Et, inCompound PtM75: R = ^(i)Pr, in Compound PtM76: R = neopentyl, inCompound PtM77: R = ^(i)Bu, in Compound PtM78: R = ^(t)Bu, in CompoundPtM79: R = Ph, in Compound PtM80: R = 2,6-(Me)₂Ph, in Compound PtM81: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM82 through PtM90, each represented bythe formula

wherein in Compound PtM82: R = Me, in Compound PtM83: R = Et, inCompound PtM84: R = ^(i)Pr, in Compound PtM85: R = neopentyl, inCompound PtM86: R = ^(i)Bu, in Compound PtM87: R = ^(t)Bu, in CompoundPtM88: R = Ph, in Compound PtM89: R = 2,6-(Me)₂Ph, in Compound PtM90: R= 2,6-(^(i)Pr)₂Ph, , Compound PtM91 through PtM102, each represented bythe formula

wherein in Compound PtM91: R = H, in Compound PtM92: R = Me, in CompoundPtM93: R = Et, in Compound PtM94: R = ^(i)Pr, in Compound PtM95: R =neopentyl, in Compound PtM96: R = ^(i)Bu, in Compound PtM97: R = ^(t)Bu,in Compound PtM98: R = Ph, in Compound PtM99: R = 4-biphenyl, inCompound PtM100: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM101: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM102: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM103 through PtM111, eachrepresented by the formula

wherein in Compound PtM103: R = Me, in Compound PtM104: R = Et, inCompound PtM105: R = ^(i)Pr, in Compound PtM106: R = neopentyl, inCompound PtM107: R = ^(i)Bu, in Compound PtM108: R = ^(t)Bu, in CompoundPtM109: R = Ph, in Compound PtM110: R = 2,6-(Me)₂Ph, in Compound PtM111:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM112 through PtM120, each representedby the formula

wherein in Compound PtM112: R = Me, in Compound PtM113: R = Et, inCompound PtM114: R = ^(i)Pr, in Compound PtM115: R = neopentyl, inCompound PtM116: R = ^(i)Bu, in Compound PtM117: R = ^(t)Bu, in CompoundPtM118: R = Ph, in Compound PtM119: R = 2,6-(Me)₂Ph, in Compound PtM120:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM121 through PtM132, each representedby the formula

wherein in Compound PtM121: R = H, in Compound PtM122: R = Me, inCompound PtM123: R = Et, in Compound PtM124: R = ^(i)Pr, in CompoundPtM125: R = neopentyl, in Compound PtM126: R = ^(i)Bu, in CompoundPtM127: R = ^(t)Bu, in Compound PtM128: R = Ph, in Compound PtM129: R =4-biphenyl, in Compound PtM130: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM131:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM132: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM133 through PtM141, eachrepresented by the formula

wherein in Compound PtM133: R = Me, in Compound PtM134: R = Et, inCompound PtM135: R = ^(i)Pr, in Compound PtM136: R = neopentyl, inCompound PtM137: R = ^(i)Bu, in Compound PtM138: R = ^(t)Bu, in CompoundPtM139: R = Ph, in Compound PtM140: R = 2,6-(Me)₂Ph, in Compound PtM141:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM142 through PtM153, each representedby the formula

wherein in Compound PtM142: R = H, in Compound PtM143: R = Me, inCompound PtM144: R = Et, in Compound PtM145: R = ^(i)Pr, in CompoundPtM146: R = neopentyl, in Compound PtM147: R = ^(i)Bu, in CompoundPtM148: R = ^(t)Bu, in Compound PtM149: R = Ph, in Compound PtM150: R =4-biphenyl, in Compound PtM151: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM152:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM153: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM154 through PtM162, eachrepresented by the formula

wherein in Compound PtM154: R = Me, in Compound PtM155: R = Et, inCompound PtM156: R = ^(i)Pr, in Compound PtM157: R = neopentyl, inCompound PtM158: R = ^(i)Bu, in Compound PtM159: R = ^(t)Bu, in CompoundPtM160: R = Ph, in Compound PtM161: R = 2,6-(Me)₂Ph, in Compound PtM162:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM163 through PtM174, each representedby the formula

wherein in Compound PtM163: R = H, in Compound PtM164: R = Me, inCompound PtM165: R = Et, in Compound PtM166: R = ^(i)Pr, in CompoundPtM167: R = neopentyl, in Compound PtM168: R = ^(i)Bu, in CompoundPtM169: R = ^(t)Bu, in Compound PtM170: R = Ph, in Compound PtM171: R =4-biphenyl, in Compound PtM172: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM173:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM174: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM175 through PtM183, eachrepresented by the formula

wherein in Compound PtM175: R = Me, in Compound PtM176: R = Et, inCompound PtM177: R = ^(i)Pr, in Compound PtM178: R = neopentyl, inCompound PtM179: R = ^(i)Bu, in Compound PtM180: R = ^(t)Bu, in CompoundPtM181: R = Ph, in Compound PtM182: R = 2,6-(Me)₂Ph, in Compound PtM183:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM184 through PtM195, each representedby the formula

wherein in Compound PtM184: R = H, in Compound PtM185: R = Me, inCompound PtM186: R = Et, in Compound PtM187: R = ^(i)Pr, in CompoundPtM188: R = neopentyl, in Compound PtM189: R = ^(i)Bu, in CompoundPtM190: R = ^(t)Bu, in Compound PtM191: R = Ph, in Compound PtM192: R =4-biphenyl, in Compound PtM193: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM194:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM195: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM196 through PtM204, eachrepresented by the formula

wherein in Compound PtM196: R = Me, in Compound PtM197: R = Et, inCompound PtM198: R = ^(i)Pr, in Compound PtM199: R = neopentyl, inCompound PtM200: R = ^(i)Bu, in Compound PtM201: R = ^(t)Bu, in CompoundPtM202: R = Ph, in Compound PtM203: R = 2,6-(Me)₂Ph, in Compound PtM204:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM205 through PtM216, each representedby the formula

wherein in Compound PtM205: R = H, in Compound PtM206: R = Me, inCompound PtM207: R = Et, in Compound PtM208: R = ^(i)Pr, in CompoundPtM209: R = neopentyl, in Compound PtM210: R = ^(i)Bu, in CompoundPtM211: R = ^(t)Bu, in Compound PtM212: R = Ph, in Compound PtM213: R =4-biphenyl, in Compound PtM214: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM215:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM216: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM217 through PtM225, eachrepresented by the formula

wherein in Compound PtM217: R = Me, in Compound PtM218: R = Et, inCompound PtM219: R = ^(i)Pr, in Compound PtM220: R = neopentyl, inCompound PtM221: R = ^(i)Bu, in Compound PtM222: R = ^(t)Bu, in CompoundPtM223: R = Ph, in Compound PtM224: R = 2,6-(Me)₂Ph, in Compound PtM225:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM226 through PtM237, each representedby the formula

wherein in Compound PtM226: R = H, in Compound PtM227: R = Me, inCompound PtM228: R = Et, in Compound PtM229: R = ^(i)Pr, in CompoundPtM230: R = neopentyl, in Compound PtM231: R = ^(i)Bu, in CompoundPtM232: R = ^(t)Bu, in Compound PtM233: R = Ph, in Compound PtM234: R =4-biphenyl, in Compound PtM235: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM236:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM237: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM238 through PtM246, eachrepresented by the formula

wherein in Compound PtM238: R = Me, in Compound PtM239: R = Et, inCompound PtM240: R = ^(i)Pr, in Compound PtM241: R = neopentyl, inCompound PtM242: R = ^(i)Bu, in Compound PtM243: R = ^(t)Bu, in CompoundPtM244: R = Ph, in Compound PtM245: R = 2,6-(Me)₂Ph, in Compound PtM246:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM247 through PtM258, each representedby the formula

wherein in Compound PtM247: R = H, in Compound PtM248: R = Me, inCompound PtM249: R = Et, in Compound PtM250: R = ^(i)Pr, in CompoundPtM251: R = neopentyl, in Compound PtM252: R = ^(i)Bu, in CompoundPtM253: R = ^(t)Bu, in Compound PtM254: R = Ph, in Compound PtM255: R =4-biphenyl, in Compound PtM256 R = 2,6-(^(i)Pr)₂Ph, in Compound PtM257:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM258: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM259 through PtM267, eachrepresented by the formula

wherein in Compound PtM259: R = Me, in Compound PtM260: R = Et, inCompound PtM261: R = ^(i)Pr, in Compound PtM262: R = neopentyl, inCompound PtM263: R = ^(i)Bu, in Compound PtM264: R = ^(t)Bu, in CompoundPtM265: R = Ph, in Compound PtM266: R = 2,6-(Me)₂Ph, in Compound PtM267:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM268 through PtM279, each representedby the formula

wherein in Compound PtM268: R = H, in Compound PtM269: R = Me, inCompound PtM270: R = Et, in Compound PtM271: R = ^(i)Pr, in CompoundPtM272: R = neopentyl, in Compound PtM273: R = ^(i)Bu, in CompoundPtM274: R = ^(t)Bu, in Compound PtM275: R = Ph, in Compound PtM276: R =4-biphenyl, in Compound PtM277: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM278:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM279: R =2,4-(^(i)Pr)₂-3-dibenzofuran, , Compound PtM280 through PtM288, eachrepresented by the formula

wherein in Compound PtM280: R = Me, in Compound PtM281: R = Et, inCompound PtM282: R = ^(i)Pr, in Compound PtM283: R = neopentyl, inCompound PtM284: R = ^(i)Bu, in Compound PtM285: R = ^(t)Bu, in CompoundPtM286: R = Ph, in Compound PtM287: R = 2,6-(Me)₂Ph, in Compound PtM282:R = 2,6-(^(i)Pr)₂Ph, , Compound PtM289 through PtM312, each representedby the formula

wherein in Compound PtM289: R = Me, R′ = Me, in Compound PtM290: R = Me,R′ = ^(i)Pr, in Compound PtM291: R = Me, R′ = Ph, in Compound PtM292: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM293: R = ^(i)Pr, R′ = Me, inCompound PtM294: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM295: R =^(i)Pr, R′ = Ph, in Compound PtM296: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM297: R = Ph, R′ = Me, in Compound PtM298: R = Ph, R′ =^(i)Pr, in Compound PtM299: R = Ph, R′ = Ph, in Compound PtM300: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM301: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM302: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM303: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM304: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM305: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM306: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM307: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM308: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM309: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM310: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM311: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM312: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM313through PtM336, each represented by the formula

wherein in Compound PtM313: R = Me, R′ = Me, in Compound PtM314: R = Me,R′ = ^(i)Pr, in Compound PtM315: R = Me, R′ = Ph, in Compound PtM316: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM317: R = ^(i)Pr, R′ = Me, inCompound PtM318: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM319: R =^(i)Pr, R′ = Ph, in Compound PtM320: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM321: R = Ph, R′ = Me, in Compound PtM322: R = Ph, R′ =^(i)Pr, in Compound PtM323: R = Ph, R′ = Ph, in Compound PtM324: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM325: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM326: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM327: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM328: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM329: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM330: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM331: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM332: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM333: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM334: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM335: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM336: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM337through PtM360, each represented by the formula

wherein in Compound PtM337: R = Me, R′ = Me, in Compound PtM338: R = Me,R′ = ^(i)Pr, in Compound PtM339: R = Me, R′ = Ph, in Compound PtM340: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM341: R = ^(i)Pr, R′ = Me, inCompound PtM342: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM343: R =^(i)Pr, R′ = Ph, in Compound PtM344: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM345: R = Ph, R′ = Me, in Compound PtM346: R = Ph, R′ =^(i)Pr, in Compound PtM347: R = Ph, R′ = Ph, in Compound PtM348: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM349: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM350: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM351: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM352: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM353: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM354: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM355: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM356: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM357: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM358: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM359: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM360: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM361through PtM384, each represented by the formula

wherein in Compound PtM361: R = Me, R′ = Me, in Compound PtM362: R = Me,R′ = ^(i)Pr, in Compound PtM363: R = Me, R′ = Ph, in Compound PtM364: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM365: R = ^(i)Pr, R′ = Me, inCompound PtM366: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM367: R =^(i)Pr, R′ = Ph, in Compound PtM368: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM369: R = Ph, R′ = Me, in Compound PtM370: R = Ph, R′ =^(i)Pr, in Compound PtM371: R = Ph, R′ = Ph, in Compound PtM372: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM373: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM374: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM375: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM376: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM377: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM378: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM379: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM380: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM381: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM382: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM383: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM384: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM385through PtM408, each represented by the formula

wherein in Compound PtM385: R = Me, R′ = Me, in Compound PtM386: R = Me,R′ = ^(i)Pr, in Compound PtM387: R = Me, R′ = Ph, in Compound PtM388: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM389: R = ^(i)Pr, R′ = Me, inCompound PtM390: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM391: R =^(i)Pr, R′ = Ph, in Compound PtM392: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM393: R = Ph, R′ = Me, in Compound PtM394: R = Ph, R′ =^(i)Pr, in Compound PtM395: R = Ph, R′ = Ph, in Compound PtM396: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM397: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM398: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM399: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM400: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM401: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM402: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM403: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM404: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM405: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM406: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM407: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM408: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM409through PtM432, each represented by the formula

wherein in Compound PtM409: R = Me, R′ = Me, in Compound PtM410: R = Me,R′ = ^(i)Pr, in Compound PtM411: R = Me, R′ = Ph, in Compound PtM412: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM413: R = ^(i)Pr, R′ = Me, inCompound PtM414: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM415: R =^(i)Pr, R′ = Ph, in Compound PtM416: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM417: R = Ph, R′ = Me, in Compound PtM418: R = Ph, R′ =^(i)Pr, in Compound PtM419: R = Ph, R′ = Ph, in Compound PtM420: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM421: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM422: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM423: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM424: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM425: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM426: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM427: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM428: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM429: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM430: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM431: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM432: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM433through PtM456, each represented by the formula

wherein in Compound PtM433: R = Me, R′ = Me, in Compound PtM434: R = Me,R′ = ^(i)Pr, in Compound PtM435: R = Me, R′ = Ph, in Compound PtM436: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM437: R = ^(i)Pr, R′ = Me, inCompound PtM438: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM439: R =^(i)Pr, R′ = Ph, in Compound PtM440: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM441: R = Ph, R′ = Me, in Compound PtM442: R = Ph, R′ =^(i)Pr, in Compound PtM443: R = Ph, R′ = Ph, in Compound PtM444: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM445: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM446: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM447: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM448: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM449: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM450: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM451: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM452: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM453: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM454: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM455: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM456: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, , Compound PtM457through PtM480, each represented by the formula

wherein in Compound PtM457: R = Me, R′ = Me, in Compound PtM458: R = Me,R′ = ^(i)Pr, in Compound PtM459: R = Me, R′ = Ph, in Compound PtM460: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM461: R = ^(i)Pr, R′ = Me, inCompound PtM462: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM463: R =^(i)Pr, R′ = Ph, in Compound PtM464: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM465: R = Ph, R′ = Me, in Compound PtM466: R = Ph, R′ =^(i)Pr, in Compound PtM467: R = Ph, R′ = Ph, in Compound PtM468: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM469: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM470: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM471: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM472: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM473: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM474: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM475: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM476: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM477: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM478: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM479: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM480: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, .

In some embodiments, the compound can be an emissive dopant. In someembodiments, the compound can produce emissions via phosphorescence,fluorescence, thermally activated delayed fluorescence, i.e., TADF (alsoreferred to as E-type delayed fluorescence), triplet-tripletannihilation, or combinations of these processes.

According to another aspect of the present disclosure, a device thatincludes one or more organic light emitting devices is also provided. Atleast one of the one or more organic light emitting devices can includean anode, a cathode, and an organic layer disposed between the anode andthe cathode. The organic layer can include a compound selected from thegroup consisting of Formula M(L_(A))_(x)(L_(B))_(y)(L_(C))_(z) andFormula III, and the variations of each as described herein.

The device can be one or more of a consumer product, an electroniccomponent module, an organic light-emitting device and a lighting panel.The organic layer can be an emissive layer and the compound can be anemissive dopant in some embodiments, while the compound can be anon-emissive dopant in other embodiments.

The organic layer can also include a host. In some embodiments, the hostcan include a metal complex. The host can be a triphenylene containingbenzo-fused thiophene or benzo-fused furan. Any substituent in the hostcan be an unfused substituent independently selected from the groupconsisting of C_(n)H_(2n+1), OC_(n)H_(2n+1), OAr₁, N(C_(n)H_(2n+1))₂,N(Ar₁)(Ar₂), CH═CH—C_(n)H_(2n+1), C≡C—C_(n)H_(2n+1), Ar₁, Ar₁—Ar₂, andC_(n)H_(2n)—Ar₁, or no substitution. In the preceding substituents n canrange from 1 to 10; and Ar₁ and Ar₂ can be independently selected fromthe group consisting of benzene, biphenyl, naphthalene, triphenylene,carbazole, and heteroaromatic analogs thereof.

The host can be a compound comprising at least one chemical groupselected from the group consisting of triphenylene, carbazole,dibenzothiphene, dibenzofuran, dibenzoselenophene, azatriphenylene,azacarbazole, aza-dibenzothiophene, aza-dibenzofuran, andaza-dibenzoselenophene. The host can include a metal complex. The hostcan be a specific compound selected from the group consisting of:

and combinations thereof.

In yet another aspect of the present disclosure, a formulation thatcomprises a compound a compound selected from the group consisting ofFormula M(L_(A))_(x)(L_(B))_(y)(L_(C))_(z) and Formula III, and thevariations of each as described herein. The formulation can include oneor more components selected from the group consisting of a solvent, ahost, a hole injection material, hole transport material, and anelectron transport layer material, disclosed herein.

Combination with Other Materials

The materials described herein as useful for a particular layer in anorganic light emitting device may be used in combination with a widevariety of other materials present in the device. For example, emissivedopants disclosed herein may be used in conjunction with a wide varietyof hosts, transport layers, blocking layers, injection layers,electrodes and other layers that may be present. The materials describedor referred to below are non-limiting examples of materials that may beuseful in combination with the compounds disclosed herein, and one ofskill in the art can readily consult the literature to identify othermaterials that may be useful in combination.

HIL/HTL:

A hole injecting/transporting material to be used in the presentinvention is not particularly limited, and any compound may be used aslong as the compound is typically used as a hole injecting/transportingmaterial. Examples of the material include, but are not limited to: aphthalocyanine or porphyrin derivative; an aromatic amine derivative; anindolocarbazole derivative; a polymer containing fluorohydrocarbon; apolymer with conductivity dopants; a conducting polymer, such asPEDOT/PSS; a self-assembly monomer derived from compounds such asphosphonic acid and silane derivatives; a metal oxide derivative, suchas MeO_(x); a p-type semiconducting organic compound, such as1,4,5,8,9,12-Hexaazatriphenylenehexacarbonitrile; a metal complex, and across-linkable compound.

Examples of aromatic amine derivatives used in HIL or HTL include, butare not limited to the following general structures:

Each of Ar¹ to Ar⁹ is selected from the group consisting of aromatichydrocarbon cyclic compounds such as benzene, biphenyl, triphenyl,triphenylene, naphthalene, anthracene, phenalene, phenanthrene,fluorene, pyrene, chrysene, perylene, and azulene; the group consistingof aromatic heterocyclic compounds such as dibenzothiophene,dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran,benzothiophene, benzoselenophene, carbazole, indolocarbazole,pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole,oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole,pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine,oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine,benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline,cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine,pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine,benzofuropyridine, furodipyridine, benzothienopyridine,thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine;and the group consisting of 2 to 10 cyclic structural units which aregroups of the same type or different types selected from the aromatichydrocarbon cyclic group and the aromatic heterocyclic group and arebonded to each other directly or via at least one of oxygen atom,nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom,chain structural unit and the aliphatic cyclic group. Wherein each Ar isfurther substituted by a substituent selected from the group consistingof hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylicacids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl,phosphino, and combinations thereof.

In one aspect, Ar¹ to Ar⁹ is independently selected from the groupconsisting of:

wherein k is an integer from 1 to 20; X¹⁰¹ to X¹⁰⁸ is C (including CH)or N; Z¹⁰¹ is NAr¹, O, or S; Ar¹ has the same group defined above.

Examples of metal complexes used in HIL or HTL include, but are notlimited to the following general formula:

wherein Met is a metal, which can have an atomic weight greater than 40;(Y¹⁰¹-Y¹⁰²) is a bidentate ligand, Y¹⁰¹ and Y¹⁰² are independentlyselected from C, N, O, P, and S; L¹⁰¹ is an ancillary ligand; k′ is aninteger value from 1 to the maximum number of ligands that may beattached to the metal; and k′+k″ is the maximum number of ligands thatmay be attached to the metal.

In one aspect, (Y¹⁰¹-Y¹⁰²) is a 2-phenylpyridine derivative. In anotheraspect, (Y¹⁰¹-Y¹⁰²) is a carbene ligand. In another aspect, Met isselected from Ir, Pt, Os, and Zn. In a further aspect, the metal complexhas a smallest oxidation potential in solution vs. Fc⁺/Fc couple lessthan about 0.6 V.

Host:

The light emitting layer of the organic EL device of the presentinvention preferably contains at least a metal complex as light emittingmaterial, and may contain a host material using the metal complex as adopant material. Examples of the host material are not particularlylimited, and any metal complexes or organic compounds may be used aslong as the triplet energy of the host is larger than that of thedopant. While the Table below categorizes host materials as preferredfor devices that emit various colors, any host material may be used withany dopant so long as the triplet criteria is satisfied.

Examples of metal complexes used as host are preferred to have thefollowing general formula:

wherein Met is a metal; (Y¹⁰³-Y¹⁰⁴) is a bidentate ligand, Y¹⁰³ and Y¹⁰⁴are independently selected from C, N, O, P, and S; L¹⁰¹ is an anotherligand; k′ is an integer value from 1 to the maximum number of ligandsthat may be attached to the metal; and k′+k″ is the maximum number ofligands that may be attached to the metal.

In one aspect, the metal complexes are:

wherein (O—N) is a bidentate ligand, having metal coordinated to atoms Oand N.

In another aspect, Met is selected from Ir and Pt. In a further aspect,(Y¹⁰³-Y¹⁰⁴) is a carbene ligand.

Examples of organic compounds used as host are selected from the groupconsisting of aromatic hydrocarbon cyclic compounds such as benzene,biphenyl, triphenyl, triphenylene, naphthalene, anthracene, phenalene,phenanthrene, fluorene, pyrene, chrysene, perylene, and azulene; thegroup consisting of aromatic heterocyclic compounds such asdibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene,benzofuran, benzothiophene, benzoselenophene, carbazole,indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole,triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole,thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine,oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole,indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline,isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine,phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine,phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine,thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine;and the group consisting of 2 to 10 cyclic structural units which aregroups of the same type or different types selected from the aromatichydrocarbon cyclic group and the aromatic heterocyclic group and arebonded to each other directly or via at least one of oxygen atom,nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom,chain structural unit and the aliphatic cyclic group. Wherein each groupis further substituted by a substituent selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof.

In one aspect, the host compound contains at least one of the followinggroups in the molecule:

wherein R¹⁰¹ to R¹⁰⁷ is independently selected from the group consistingof hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylicacids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl,phosphino, and combinations thereof, when it is aryl or heteroaryl, ithas the similar definition as Ar's mentioned above. k is an integer from0 to 20 or 1 to 20; k′″ is an integer from 0 to 20. X¹⁰¹ to X¹⁰⁸ isselected from C (including CH) or N.Z¹⁰¹ and Z¹⁰² is selected from NR¹⁰¹, O, or S.HBL:

A hole blocking layer (HBL) may be used to reduce the number of holesand/or excitons that leave the emissive layer. The presence of such ablocking layer in a device may result in substantially higherefficiencies as compared to a similar device lacking a blocking layer.Also, a blocking layer may be used to confine emission to a desiredregion of an OLED.

In one aspect, compound used in HBL contains the same molecule or thesame functional groups used as host described above.

In another aspect, compound used in HBL contains at least one of thefollowing groups in the molecule:

wherein k is an integer from 1 to 20; L¹⁰¹ is an another ligand, k′ isan integer from 1 to 3.ETL:

Electron transport layer (ETL) may include a material capable oftransporting electrons. Electron transport layer may be intrinsic(undoped), or doped. Doping may be used to enhance conductivity.Examples of the ETL material are not particularly limited, and any metalcomplexes or organic compounds may be used as long as they are typicallyused to transport electrons.

In one aspect, compound used in ETL contains at least one of thefollowing groups in the molecule:

wherein R¹⁰¹ is selected from the group consisting of hydrogen,deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy,aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl,aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinationsthereof, when it is aryl or heteroaryl, it has the similar definition asAr's mentioned above. Ar¹ to Ar³ has the similar definition as Ar'smentioned above. k is an integer from 1 to 20. X¹⁰¹ to X¹⁰⁸ is selectedfrom C (including CH) or N.

In another aspect, the metal complexes used in ETL include, but are notlimited to the following general formula:

wherein (O—N) or (N—N) is a bidentate ligand, having metal coordinatedto atoms O, N or N, N; L¹⁰¹ is another ligand; k′ is an integer valuefrom 1 to the maximum number of ligands that may be attached to themetal.

In any above-mentioned compounds used in each layer of the OLED device,the hydrogen atoms can be partially or fully deuterated. Thus, anyspecifically listed substituent, such as, without limitation, methyl,phenyl, pyridyl, etc. encompasses undeuterated, partially deuterated,and fully deuterated versions thereof. Similarly, classes ofsubstituents such as, without limitation, alkyl, aryl, cycloalkyl,heteroaryl, etc. also encompass undeuterated, partially deuterated, andfully deuterated versions thereof.

In addition to and/or in combination with the materials disclosedherein, many hole injection materials, hole transporting materials, hostmaterials, dopant materials, exciton/hole blocking layer materials,electron transporting and electron injecting materials may be used in anOLED. Non-limiting examples of the materials that may be used in an OLEDin combination with materials disclosed herein are listed in Table Abelow. Table A lists non-limiting classes of materials, non-limitingexamples of compounds for each class, and references that disclose thematerials.

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EXPERIMENTAL

Calculations—Tetradentate Platinum Pyrazole Emitters

Computational Methods.

All calculations presented used the Gaussian 09 package. Specifically,the B3LYP functional was employed in conjunction with the CEP-31geffective core potentials and valence base set. The bonds targeted forbond strength evaluation were manually broken and the geometryre-optimized to confirm the bond does not reform. Thermodynamics of bondbreaking were calculated as:Bond Strength=[³product(bond broken)−³reactant(bonded)]*627.51where the product is in the triplet state (³) and the reactant is takento be the excited state triplet (³). Thermochemistry is determined at 1atm and 298.15 K.

Results.

Bond strength calculations were performed on three comparative examplesand two compounds described herein. The bonds are defined as shown belowand bond strength values are shown in Table 1.

Comparative Examples 1 and Comparative Examples 2 and 3 show the effecton the N—N bond with bottom oxygen tether and top ethyl and phenyltethers, respectively. Comparative Example 1 has the weakest N—N bondstrength with a value of only 1.02 kcal/mol. Using a top tether, such asethyl or phenyl, strengthens this bond significantly, but the bondstrength is even more greatly improved with both a side tether and toptether structure. Compounds Pt55 and Pt445, with such structural teters,are shown to have further significant increase in N—N bond strength withvalues of 16.78 and 17.57 kcal/mol, respectively. Therefore it isdemonstrated that it is the combination of top and side tethering thatleads to biggest increase in N—N bond strength.

TABLE 1 Triplet energies and bond strengths for the platinum complexesstudied. Energies reported in kcal/mol. Compound T1 (nm) N-Ph N-C N-NM-N Comparative 450 31.78 26.99 1.02 13.58 Example 1 Comparative 45631.38 27.26 7.93 n/a Example 2 Comparative 473 n/a n/a 6.0 n/a Example 3Compound 459 n/a n/a 16.78 n/a Pt55 Compound 479 n/a n/a 17.57 n/a Pt445

SYNTHESIS EXAMPLES Synthesis of Compounds Ir1, Ir872, Ir874, and Ir888

The following is a general schematic for the synthesis of Compound Ir1,Compound Ir872, Compound Ir874, and Compound Ir888.

Synthesis of (E)-methyl5-(dimethylamino)-2,2-dimethyl-3-oxopent-4-enoate (1)

A mixture of methyl 2,2-dimethyl-3-oxobutanoate (5.01 ml, 34.7 mmol) and1,1-dimethoxy-N,N-dimethylmethanamine (12 ml, 90 mmol) was stirred at100° C. for three days. 50 mL of toluene was added and the solvents wereremoved under nitrogen, yielding (E)-methyl5-(dimethylamino)-2,2-dimethyl-3-oxopent-4-enoate (1) as an orange oilthat solidifies slowly, 7.54 g.

Synthesis of methyl 2-methyl-2-(1-phenyl-1H-pyrazol-5-yl)propanoate (2)

A solution of (E)-methyl5-(dimethylamino)-2,2-dimethyl-3-oxopent-4-enoate (1) (7.354 g, 36.9mmol) and phenylhydrazine (4.00 ml, 40.6 mmol) in THF (250 ml) wascooled in an ice bath. Trifluoromethanesulfonic acid (3.58 ml, 40.6mmol) acid was added and the resulting mixture was stirred cold for 30minutes, then warmed to room temperature (˜22° C.) and stirredovernight. Water, brine, and saturated Na₂CO₃ were added to the mixtureand the resulting mixture was extracted with EtOAc several times. Thecombined organics were separated then washed with brine, dried, andvacuumed down to an orange oil that solidifies, 15.8 g. Columnchromatography of this mixture yielded methyl2-methyl-2-(1-phenyl-1H-pyrazol-5-yl)propanoate (2) as a pale yellow,crystalline solid, 7.68 g (85%).

Synthesis of 2,3-dimethyl-3-(1-phenyl-1H-pyrazol-5-yl)butan-2-ol (3)

A solution of methyl 2-methyl-2-(1-phenyl-1H-pyrazol-5-yl)propanoate (2)(5.57 g, 22.80 mmol) in THF (150 ml) was cooled in an isopropyl alcohol(^(i)PrOH)/CO₂ bath and a methyllithium solution in ether (1.6M, 57.0ml, 91 mmol) was added via syringe. The reaction mixture was stirredcold for 6 hours cold then warmed to room temperature (˜22° C.), atwhich point the reaction mixture was quenched with water. Extractionwith ethyl acetate (EtOAc) and column chromatography yielded 2.82 g(51%) of 2,3-dimethyl-3-(1-phenyl-1H-pyrazol-5-yl)butan-2-ol (3) as acolorless solid.

Synthesis of 4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinoline (4)

To a solution of 2,3-dimethyl-3-(1-phenyl-1H-pyrazol-5-yl)butan-2-ol (3)(2.82 g, 11.54 mmol) in CHCl₃ (100 ml) was added solid aluminumtrichloride (4.62 g, 34.6 mmol) and the mixture was stirred at roomtemperature for 30 minutes. Quenching followed by filtering through asilica plug with 100% DCM yielded product as a pale yellow oil, 2.8 g(94%).

Synthesis of Dimer (5)

4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinoline (4) (2.32 g,10.25 mmol) was dissolved in 3:1 2-ethoxyethanol/water (40 ml), spargedfor 15 minutes with nitrogen, then iridium(III) chloride hydrate (1.649g, 4.45 mmol) was added. Nitrogen sparge was continued for 5 minutesmore, then the mixture was stirred at reflux overnight (˜12 hours). Themixture was cooled to room temperature (˜22° C.), diluted with methylalcohol (MeOH), and filtered, then the solids were washed with MeOH toyield the dimer 5 as a pale yellow powder, 2.95 g (98%).

Synthesis of Complex Ir1 (6)

4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinoline (4) (0.63 g,2.78 mmol) and Ir(acac)₃ (0.27 g, 0.552 mmol) were combined in a schlenktube with 15 drops of tridecane. The flask was degassed with longvacuum/backfill cycles, then maintained at reflux for three days. Thereaction mixture was coated on a silica gel and purified by columnchromatography followed by trituration in hot acetonitrile (MeCN) gogive 0.055 g of Compound Ir1 (6).

Synthesis of Triflate (7)

Silver triflate (0.795 g, 3.10 mmol) in MeOH (7.14 ml) was added to asolution of dimer (5) (2.00 g, 1.47 mmol) in DCM (50 ml), and the tealmixture was stirred overnight (˜12 hours) at room temperature (˜22° C.),covered in foil. The mixture was then filtered through silica gel, whichwas then washed with DCM until the filtrates were colorless. Thefiltrates were vacuumed down to yield triflate (7) as a greenish, foamysolid, 2.48 g (98%).

Synthesis of Compound Ir872

11,12-diethyl-3-methylbenzo[h]benzo[4,5]imidazo[2,1-f][1,6]naphthyridine(0.222 g, 0.654 mmol) and triflate (7) (0.280 g, 0.327 mmol) werecombined in 2-ethoxyethanol (2 ml). The mixture was degassed, thenrefluxed under nitrogen overnight (˜12 hours). The resulting mixture wasdiluted with MeOH and filtered. The crude filtrate was purified bycolumn chromatography to yield 0.031 g of clean Compound Ir872.

Synthesis of Compound Ir874

10-methylbenzo[h]imidazo[2,1-f][1,6]naphthyridine (0.373 g, 1.600 mmol)and triflate (7) (0.685 g, 0.800 mmol) were combined in 2-ethoxyethanol(3 ml). The mixture was degassed, then refluxed under nitrogen for 3.5hours. The mixture was diluted with methanol (MeOH) and filtered. Thecrude filtrate was purified by column chromatography to afford a yellowsolid that was triturated in hot heptanes to yield 0.53 g of CompoundIr874 as a nearly colorless solid (75%).

Synthesis of Compound 888

4-(methyl-d3)-2,5-diphenylpyridine (0.527 g, 2.124 mmol) and triflate 7(0.606 g, 0.708 mmol) were combined in ethanol (10 ml). The mixture wasdegassed and refluxed for 2.5 hours. The solvent was then removed undervacuum. The residue was dissolved in dichloromethane (DCM) and passedthrough a silica column, then the DCM was washed until the color wasremoved. The filtrates were coated on a plug of silica gel and purifiedusing column chromatography to yield Compound Ir888 as a yellow solid,0.219 g.

Synthesis of Comparative Examples 13 & 14

Synthesis of Dimer (11)

Iridium chloride hydrate (6.00 g, 17.02 mmol) and 1-phenyl-1H-pyrazole(5.89 g, 40.9 mmol) were combined in 2-ethoxyethanol (120 ml) and water(40 ml). The reaction mixture was heated to reflux overnight (˜12 hours)under nitrogen. The resulting solid was filtered off and washed withmethanol and dried to yield 8.3 g of dimer 11.

Synthesis of Triflate (12)

Dimer 11 (8.3 g, 8.07 mmol) was dissolved in 100 mL of DCM and asolution of silver triflate (AgOTf) (4.36 g, 16.96 mmol) in 20 mL ofmethanol was added. The reaction mixture was stirred at room temperature(˜22° C.) under nitrogen for 1 hour. The mixture was filtered through aplug of silica gel and the cake was washed with DCM. The filtrates wereevaporated to yield 10.85 g of triflate 12 (97%).

Synthesis of Comparative Example 13

11,12-diethyl-3-methylbenzo[h]benzo[4,5]imidazo[2,1-f][1,6]naphthyridine(0.151 g, 0.445 mmol) and triflate 12 (0.154 g, 0.223 mmol) werecombined in 2-ethoxyethanol (2 ml). The mixture was degassed andrefluxed overnight (˜12 hours). The mixture was cooled to roomtemperature (˜22° C.), diluted with MeOH, and an orange precipitate wasfiltered and washed with MeOH yielding 0.086 g of Comparative Example13, 47%.

Synthesis of Comparative Example 14

A mixture of 4-(methyl-d3)-2,5-diphenylpyridine (1.077 g, 4.34 mmol) andtriflate 11 (1 g, 1.446 mmol) in ethanol (10 ml) was degassed andrefluxed overnight (˜12 hours). The solvent was removed under vacuum andthe residue was dissolved in DCM and filtered through a silica plug. Theyellow filtrates were purified by column chromatography to isolateComparative Example 14, which was triturated twice in hot toluene andonce in hot acetonitrile (MeCN) to yield 0.434 g of Comparative Example14.

Synthesis of Compound Pt1

The following is a general scheme for synthesizing Compound Pt1, and isfollowed by more detailed explanation of the scheme.

Synthesis of 4-(2-Iodophenyl)butan-2-one (15)

A mixture of 2-iodobenzyl bromide (9 g, 30.3 mmol, 1 equiv), potassiumcarbonate (4.18 g, 30.3 mmol, 1 equiv), and acetyl-acetone (3.4 mL, 33.4mmol, 1.1 equiv) in absolute ethanol (90 mL) was refluxed overnight (˜12hours). The mixture was cooled to room temperature (˜22° C.) andcombined with another 1 g reaction mixture. The mixture was diluted withwater (200 mL) and methyl tert-butyl ether (MTBE) (200 mL), and thelayers were separated. The aqueous layer was extracted with MTBE (200mL). The combined organic layers were washed with saturated brine, thenconcentrated under reduced pressure. The residue was purified by columnchromatography to yield 4-(2-Iodophenyl)butan-2-one (15) as a colorlessoil (5.7 g, 62% yield).

Synthesis of Ethyl 6-(2-iodophenyl)-2,4-dioxohexanoate (16)

21% Sodium ethoxide in ethanol (6 mL, 16.2 mmol, 1.08 equiv) was slowlyadded to a mixture of 4-(2-Iodophenyl)butan-2-one 15 (4.1 g, 15 mmol, 1equiv) and diethyl oxalate (2.1 mL, 16.2 mmol, 1.08 equiv) in absoluteethanol (41 mL) maintaining the internal temperature below −2° C. Afterthe addition was complete, the reaction mixture was warmed to roomtemperature (˜22° C.). The mixture was stirred for 3 days. Water (200mL) was added and the pH was adjusted to 5-6 with 10% HCl. The aqueoussolution was extracted with ethyl acetate (3×200 mL). The combinedorganic layers were washed with saturated brine (2×100 mL) andconcentrated under reduced pressure. The residue was purified by columnchromatography to give ethyl 6-(2-iodophenyl)-2,4-dioxohexanoate (16) asa yellow oil (3.3 g, 59% yield, 82% purity).

Synthesis of Ethyl 5-(2-iodophenethyl)-1H-pyrazole-3-carboxylate (17)

A mixture of ethyl 6-(2-iodophenyl)-2,4-dioxohexanoate 16 (3.3 g, 8.8mmol, 1 equiv) and hydrazine monohydrate (0.47 mL, 9.7 mmol, 1.1 equiv)in acetic acid (10 mL) was stirred at 110° C. for 2 hours. The mixturewas cooled to room temperature (˜22° C.) and poured into ice water (10mL). The slurry was carefully neutralized with sodium bicarbonate andfiltered. The solid was washed with water and dried under vacuum at 40°C., overnight (˜12 hours) to give Ethyl5-(2-iodophenethyl)-1H-pyrazole-3-carboxylate (17) as a tan solid (3.26g, 99% yield).

Synthesis of Ethyl 4,5-dihydropyrazolo[1,5-a]quinoline-2-carboxylate(18)

A mixture of 17 (3.12 g, 8.43 mmol, 1 equiv), copper(I) iodide (80 mg,0.42 mmol, 0.05 equiv), potassium carbonate (2.33 g, 16.9 mmol, 2equiv), and N,N′-dimethyl-ethylenediamine (0.16 mL, 1.89 mmol, 0.22equiv) in toluene (150 mL) was refluxed for 1 day. The mixture wascooled and quenched with ice water (100 mL). The layers were separatedand the aqueous layer was extracted with THF (2×200 mL). The combinedorganic layers were filtered through a pad of celite and concentratedunder reduced pressure. The residue was purified by columnchromatography to give ethyl4,5-dihydropyrazolo[1,5-a]quinoline-2-carboxylate 18 as a yellow oil(1.8 g, 90% yield).

Synthesis of (4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methanol (19)

Red-Al® (sodium bis(2-methoxyethoxy)aluminum dihydride, sold bySigma-Aldrich) (55 mL, 196 mmol, 4 equiv) was slowly added to a solutionof ethyl 4,5-dihydropyrazolo[1,5-a]quinoline-2-carboxylate 18 (11.9 g,49.1 mmol, 1 equiv) in THF (240 mL), maintaining the internaltemperature below −5° C. The slurry was stirred overnight (˜12 hours).The mixture was carefully acidified with 3N HCl to pH 1-2. The mixturewas diluted with water (200 mL) and ethyl acetate (200 mL) and thelayers were separated. The aqueous layer was extracted with ethylacetate (2×400 mL). The combined organic layers were washed withsaturated brine (200 mL) and concentrated under reduced pressure. Theresidue was dried under vacuum at 40° C. for 2 hours to give(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methanol (19) as a yellow solid(9.02 g, 92% yield).

Synthesis of 2-(Bromomethyl)-4,5-dihydropyrazolo[1,5-a]quinolone (20)

Phosphorus tribromide (3 mL, 31.8 mmol, 1.2 equiv) was slowly added to asolution of (4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methanol (19) (5.3g, 26.5 mmol, 1 equiv) in dichloromethane (50 mL), maintaining theinternal temperature below −5° C. The solution was stirred at roomtemperature (˜22° C.) overnight (˜12 hours). Water (100 mL) was addedand the mixture was carefully neutralized with sodium bicarbonate. Thelayers were separated and the aqueous layer was extracted withdichloromethane (200 mL). The combined organic layers were washed withsaturated brine (100 mL) and concentrated under reduced pressure. Thesolid was dried under vacuum at 40° C. overnight to give2-(bromomethyl)-4,5-dihydropyrazolo[1,5-a]quinolone (20) as a yellowsolid (6.2 g, 90% yield).

Synthesis of ((4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methyl)triphenylphosphonium bromide (21)

A mixture of 2-(bromomethyl)-4,5-dihydropyrazolo[1,5-a]quinolone 20 (6.2g, 23 mmol, 1 equiv) and triphenylphosphine (6.6 g, 25.3 mmol, 1.1equiv) in toluene was refluxed for 4 hours. The slurry was cooled andfiltered. The solid was dried under vacuum at 40° C. for 3 hours to give((4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methyl) triphenylphosphoniumbromide (21) as a white solid (9.31 g, 77% yield).

Synthesis of 4,5-Dihydropyrazolo[1,5-a]quinoline-2-carbaldehyde (22)

A slurry of (4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methanol (19) (4.9g, 24.5 mmol, 1 equiv) and activated manganese oxide (27 g, 318 mmol, 13equiv) in 1,2-dichloroethane (150 mL) was stirred at 75° C. for 3 hours.The reaction mixture was cooled to room temperature (˜22° C.) andfiltered through a pad of silica gel. The filtrate was concentratedunder reduced pressure to give4,5-dihydropyrazolo[1,5-a]quinoline-2-carbaldehyde (22) as a yellow oil(3.3 g).

Synthesis of 1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane (23)

2.5M n-Butyllithium in hexanes (6.7 mL, 16.8 mmol, 1.03 equiv) was addedslowly to a solution of((4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)methyl) triphenylphosphoniumbromide (21) (9.1 g, 17.3 mmol, 1.06 equiv) in THF (180 mL) whilemaintaining the reaction temperature below −70° C. After 20 minutes, asolution of 4,5-Dihydropyrazolo[1,5-a]quinoline-2-carbaldehyde (22)(3.23 g, 16.3 mmol, 1 equiv) in THF (10 mL) was slowly added to themixture while maintaining the reaction temperature below −70° C. Thereaction mixture was then stirred at room temperature (˜22° C.)overnight (˜12 hours). Water (200 mL) and ethyl acetate (100 mL) wereadded and the layers were separated. The aqueous layer was extractedwith ethyl acetate (2×200 mL). The combined organic layers were washedwith saturated brine (100 mL) and concentrated under reduced pressure.The resulting solid was triturated with methanol and filtered to give afirst crop as an off-white solid (2.8 g). The filtrate was thenconcentrated under reduced pressure and the residue was purified bycolumn chromatography to give a total of 4.4 g of1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane (23) as anoff-white solid (74%).

Synthesis of 1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane (24)

A mixture of 1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane (23)(4.3 g, 11.8 mmol, 1 equiv) and 10% palladium on carbon (0.86 g) in THF(600 mL) and ethanol (400 mL) was hydrogenated at 50 psi overnight (˜12hours). The solution was filtered through a pad of silica gel and thefiltrate was concentrated under reduced pressure. The resulting solidwas triturated with 2-propanol (˜30 mL) and dried under vacuum at 40° C.overnight (˜12 hours) to give1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane (24) as a whitesolid (3.5 g, 81% yield).

Synthesis of Compound Pt1

A solution of 1,2-bis(4,5-Dihydropyrazolo[1,5-a]quinolin-2-yl)ethane(24) (2.77 g, 7.57 mmol, 1 equiv) in tridecane (310 mL) was sparged withargon for 40 minutes. Pt(acac)₂ (2.98 g, 7.57 mmol, 1 equiv) was thenadded and the reaction mixture was heated at 220-230° C. (externaltemperature) for 48 hours. After cooling to room temperature (˜22° C.),the reaction mixture was passed through a pad of silica gel (30 g) andwashed with dichloromethane (80 ml). After removing the solvent underreduced pressure, the residue was purified a total of three times bycolumn chromatography to give Compound Pt1 (210 mg) as a yellow solid.

Synthesis of Compound Pt31

The following is a general scheme for synthesizing Compound Pt31, and isfollowed by more detailed explanation of the scheme.

Synthesis of 2,2,5,5-tetramethoxyhexane (26)

A mixture of hexane-2,5-dione (25) (28 ml, 239 mmol), trimethoxymethane(131 ml, 1193 mmol), and tosylic acid hydrate (1.135 g, 5.97 mmol) inMeOH (250 ml) was refluxed overnight (˜12 hours). 2 mL of triethyl amine(Et₃N) was added and the solvent was removed under vacuum. The residuewas diluted with diethyl ether (Et₂O), then washed with 5% NaOH in 50%brine followed by water, then dried and filtered. The filtrate wasvacuumed down and distilled under vacuum at 90-100° C./78° C.(bath/vapor temp), yielding 44.19 g of 2,2,5,5-tetramethoxyhexane (26)as a colorless oil (90%).

Synthesis of(3Z,7Z)-1,1,1,10,10,10-hexachloro-4,7-dimethoxydeca-3,7-diene-2,9-dione(27)

A solution of 2,2,5,5-tetramethoxyhexane (26) (34.7 g, 168 mmol) andpyridine (54.3 ml, 673 mmol) in DCM (400 ml) was stirred at −10° C. anda solution of 2,2,2-trichloroacetyl chloride (75 ml, 673 mmol) in DCM(200 ml) was added dropwise. The reaction mixture was stirred at roomtemperature (˜22° C.) for two days and washed twice with 500 mL 0.1 MHCl, then three times with 250 mL water, before being dried and coatedon silica gel. Purification by silica gel chromatography yielded(3Z,7Z)-1,1,1,10,10,10-hexachloro-4,7-dimethoxydeca-3,7-diene-2,9-dione(27) as a yellow oil that solidified upon standing, 53.59 g (74%).

Synthesis of 1,2-bis(1-phenyl-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane(28)

A solution of yielded(3Z,7Z)-1,1,1,10,10,10-hexachloro-4,7-dimethoxydeca-3,7-diene-2,9-dione(27) (21.219 g, 49.0 mmol) in THF (500 ml) was cooled in an ice bath,then phenylhydrazine (10.14 ml, 103 mmol) was added over 15 minutes. Thesolution was stirred in an ice bath for 9 hours, then overnight (˜12hours) at room temperature (˜22° C.). The orange mixture was thenstirred at 55° C. for 4 hours, and the solvent was removed under vacuum.The residue was triturated in DCM to yield some clean product as asolid. The filtrate was further chromatographed on silica gel to yield atotal of 20.8 g of1,2-bis(1-phenyl-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane (28) as abeige/yellow solid, 77%.

Synthesis 3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylicacid) (29)

A mixture of 75% sulfuric acid (3:1 dilution of conc. acid and water)(36.5 ml, 493 mmol) and1,2-bis(1-phenyl-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane (28) (18.045g, 32.9 mmol) was heated at 100° C., while passing outgassed HCl througha KOH/water trap. After 4 hours the reaction mixture was cooled to roomtemperature (22° C.) and diluted with 400 mL of ice water. The beigeprecipitate was filtered, washed twice with water, and dried undervacuum to yield 13.2 g of3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylic acid) (29)(quant.).

Synthesis of dimethyl3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylate) (30)

A mixture of 3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylicacid) (29) (13.25 g, 32.9 mmol), potassium carbonate (18.20 g, 132mmol), and iodomethane (6.15 ml, 99 mmol) was stirred at roomtemperature (˜22° C.) overnight (˜12 hours). The solvent was removed bykugelrohr and the residue was sonicated in 100 mL water, then filtered,and the solids washed with water then ether. The solids were dried toyield dimethyl3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylate) (30) as abeige solid, 13.43 g (95%).

Synthesis of(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))dimethanol (31)

Dimethyl 3,3′-(ethane-1,2-diyl)bis(1-phenyl-1H-pyrazole-5-carboxylate)(30) (13.23 g, 30.7 mmol) was suspended in THF (300 ml), cooled in anice bath, and lithium aluminum hydride (LAH) solution in THF was added(2M, 70 ml, 140 mmol) and the homogeneous solution was warmed to roomtemperature (˜22° C.). After 2 hours, the reaction solution was cooledin an ice bath and quenched with 8 mL of water, followed by saturatedNa₂CO₃. The solvent was removed under vacuum and the residue wasextracted six times with 100 mL warm DMF. DMF was removed from thefiltrates by kugelrohr and the beige solid was triturated with 100 mLEt₂O, washed with ether and dried to give 11.00 g of(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))dimethanol (31) as asolid, (96%).

Synthesis of 1,2-bis(5-(bromomethyl)-1-phenyl-1H-pyrazol-3-yl)ethane(32)

Tribromophosphane (7.78 ml, 83 mmol) was added to a suspension of(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))dimethanol (31)(10.33 g, 27.6 mmol) in CHCl₃ (276 ml) in an ice bath. The reactionmixture was stirred at 50° C. for 2 days, cooled in an ice bath, andquenched with water and then basified to pH 9 using aqueous NaOH. Theaqueous phase was extracted with DCM, the organics were dried, and thesolvent was removed under vacuum. Purification by column chromatographyyielded 1,2-bis(5-(bromomethyl)-1-phenyl-1H-pyrazol-3-yl)ethane (32) asa white solid, 11.34 g (82%).

Synthesis of dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))diacetate (33)

Step 1:

1,2-bis(5-(bromomethyl)-1-phenyl-1H-pyrazol-3-yl)ethane (32) (11.47 g,22.93 mmol), ground cyanopotassium (4.48 g, 68.8 mmol), and sodiumiodide (0.344 g, 2.293 mmol) were stirred in anhydrous DMF (50 ml) for 3days, then the solvent was removed via kugelrohr. The residue waspartitioned between mildly-basic water and EtOAc until all the solidsdissolved. After washing the organics with water, 5% LiCl, and sat.NaCl, the solvent was evaporated to yield 9.08 g of an orangish oil thatwas taken to the next step without further purification.

Step 2:

The crude dinitrile was dissolved in MeOH (125 ml) and heated to reflux,before sodium hydroxide (9.25 g, 231 mmol) dissolved in ˜25 mL water wasadded. The reaction solution was refluxed overnight (˜12 hours), theMeOH was removed under vacuum. 500 mL of water was added to the reactionmixture, which was then washed twice with DCM. Next the water layer wasacidified with concentrated HCl. The beige solid was filtered, washedwith water and dried under vacuum to yield 8.53 g of crude diacid.

Step 3:

The crude diacid was dissolved in DMF (75 ml). Potassium carbonate(10.95 g, 79 mmol) and iodomethane (3.70 ml, 59.4 mmol) were added andthe mixture was stirred at room temperature (˜22° C.) overnight (˜12hours). The DMF was removed by kugelrohr and the residue was partitionedbetween water and EtOAc. The organics were dried, and purified bychromatography to yield dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))diacetate (33)as a pale yellow oil, 3.03 g (30% over three steps).

Synthesis of dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2-methylpropanoate)(34)

Dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))diacetate (33)(3.00 g, 6.54 mmol) was dissolved in dry DMF (50 ml), then iodomethane(3.26 ml, 52.3 mmol) was added. The reaction solution was cooled in anice bath, then a sodium hydride suspension in mineral oil (60%, 2.094 g,52.3 mmol) was added, and the resulting mixture was stirred overnightunder nitrogen at room temperature (˜22° C.). The DMF was removed bykugelrohr and the residue was partitioned between water and EtOAc. Theorganics were dried and vacuumed down to yield dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2-methylpropanoate)(34) as a pale yellow solid, 3.49 g (quant.).

Synthesis of3,3′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2,3-dimethylbutan-2-ol)(35)

Dimethyl2,2′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2-methylpropanoate)(34) (3.4 g, 6.61 mmol) was dissolved in THF (100 ml), then cooled in anisopropyl alcohol (^(i)PrOH)/CO₂ bath. Methyllithium solution in ether(1.6 M, 25 ml, 40.0 mmol) was added and the resulting mixture wasstirred cold for 3 hours, then quenched with water/brine, and warmed toroom temperature (˜22° C.). The mixture was extracted twice with ethylacetate (EtOAc), then the organics were washed with brine, dried, andchromatographed to yield3,3′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2,3-dimethylbutan-2-ol)(35) as a white solid, 0.78 g (23%).

Synthesis of1,2-bis(4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinolin-2-yl)ethane(36)

3,3′-(ethane-1,2-diylbis(1-phenyl-1H-pyrazole-3,5-diyl))bis(2,3-dimethylbutan-2-ol)(35) (0.85 g, 1.651 mmol) was dissolved in CHCl₃ (50 ml) at roomtemperature (˜22° C.) and aluminum trichloride (1.321 g, 9.91 mmol) wasadded quickly. The resulting mixture was stirred for one hour, until itturned purple, then quenched with saturated Na₂CO₃. The mixture wasextracted three times with DCM, then the organics were dried and coatedon silica gel. The product was purified by column chromatography toyield1,2-bis(4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinolin-2-yl)ethane(36) as a colorless solid, 0.50 g (63%).

Synthesis of Compound Pt31

1,2-bis(4,4,5,5-tetramethyl-4,5-dihydropyrazolo[1,5-a]quinolin-2-yl)ethane(36) (0.50 g, 1.045 mmol) and Pt(acac)₂ (0.411 g, 1.045 mmol) werecombined in tridecane (5 ml), then degassed and heated at reflux for 3days. The mixture was coated on a plug of silica gel, chromatographed,and the resulting solid was triturated in MeOH/DCM to yield CompoundPt31 as a light yellow solid, 0.434 g (65%).

Synthesis of Compound PtM1

The following is a general scheme for synthesizing Compound PtM1, and isfollowed by more detailed explanation of the scheme.

Synthesis of1,2-bis(1-(3-bromophenyl)-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane(37)

(3Z,7Z)-1,1,1,10,10,10-hexachloro-4,7-dimethoxydeca-3,7-diene-2,9-dione(27) (30.00 g, 69.3 mmol) was dissolved in THF (600 ml) and cooled inice bath, then a solution of (3-bromophenyl)hydrazine (28.5 g, 152 mmol)in THF (100 ml) was added using a dropping funnel over about 1 hour. Thereaction mixture was stirred in an ice bath for 9 hours, then maintainedat room temperature (˜22° C.) overnight, before being heated to 60° C.for 48 hours to produce a heterogeneous mixture. Removal of solvent andtrituration in DCM yielded product1,2-bis(1-(3-bromophenyl)-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane(37) as a light colored solid, 40.93 g (84%)

Synthesis of3,3′-(ethane-1,2-diyl)bis(1-(3-bromophenyl)-1H-pyrazole-5-carboxylicacid) (38)

1,2-bis(1-(3-bromophenyl)-5-(trichloromethyl)-1H-pyrazol-3-yl)ethane(37) (40.70 g, 57.6 mmol) was suspended in ˜75% sulfuric acid (3:1dilution of conc. H₂SO₄:H₂O) (80 ml, 1080 mmol) in a 1 L flask andheated at ˜110° C. with stirring, while outgasses passed through a KOHtrap. Foaming ensued but subsequently dissipated after approximately 30minutes. The reaction mixture was stirred two hours more, then cooled toroom temperature (˜22° C.) and diluted with ice water to ˜900 mL andstirred for 15 minutes. The deposited beige powder was filtered, washedwith water, and dried to yield 31.10 g of3,3′-(ethane-1,2-diyl)bis(1-(3-bromophenyl)-1H-pyrazole-5-carboxylicacid) (38) as a pale solid, 96%.

Synthesis of 1,2-bis(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethane (39)

3,3′-(ethane-1,2-diyl)bis(1-(3-bromophenyl)-1H-pyrazole-5-carboxylicacid) (38) (10.08 g, 17.99 mmol) was placed in a flask with a stir barin a sand bath, then vacuum/backfilled three times with nitrogen. Theflask was heated without stirring under nitrogen until the solids beganto melt (˜225° C. bath temp) and CO₂ gas was evolved. Once the solidswere fully melted and degassing had stopped, gentle stirring was startedand continued for another 5 minutes. The brown liquid was cooled to roomtemperature (˜22° C.), forming a glass that was purified by columnchromatography to yield 1,2-bis(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethane(39) as a pale orange solid, 7.03 g (83%).

Synthesis ofN-(3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)phenyl)-N-phenylacetamide(40)

1,2-bis(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethane (39) (6.99 g, 14.80mmol), N-phenylacetamide (1.00 g, 7.40 mmol), potassium phosphate (3.93g, 18.50 mmol), N,N-dimethylglycine (0.153 g, 1.480 mmol), and copper(I)iodide (0.282 g, 1.480 mmol) were combined in a schlenk flask that wasevacuated/backfilled with nitrogen. DMF was added (15 ml) to the flaskvia syringe and refluxed overnight (˜12 hours). The mixture was pouredinto water/brine and extracted three times with EtOAc. The organics werethen washed with several charges of 5% LiCl (aq) and brine, then dried,and coated on Celite (silica gel). Column chromatography yieldedN-(3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)phenyl)-N-phenylacetamide40 as a pale beige foam, 2.10 g (54%).

Synthesis of3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)-N-phenylaniline(41)

N-(3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)phenyl)-N-phenylacetamide(40) (2.05 g, 3.89 mmol) was stirred in a 20 wt % KOH solution in EtOH(80 ml, 3.89 mmol) and refluxed overnight (˜12 hours). The mixture wascooled to room temperature (˜22° C.), diluted in 500 mL water, andextracted three times with CHCl₃. The organics were washed with water,then brine, before being dried, vacuumed down to yield3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)-N-phenylaniline(41) as a brown/orange, tacky oil, 1.99 g, which was used in the nextstage without further purification.

Synthesis of(1²Z,5²Z)-3-phenyl-1¹H,5¹H-3-aza-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzena-cycloheptaphane(42)

A solution of3-(3-(2-(1-(3-bromophenyl)-1H-pyrazol-3-yl)ethyl)-1H-pyrazol-1-yl)-N-phenylaniline41 (683 mg, 1.41 mmol, 1 equiv) in toluene (20 mL) was sparged withnitrogen for 15 minutes. This solution was then added via a syringe pump(1 ml/hr) to a refluxing mixture of tributylphosphoniumtetrafluoroborate (46 mg, 0.16 mmol, 0.1 equiv), Pd₂(dba)₃ (73 mg, 0.08mmol, 0.05 equiv), and sodium t-butoxide (460 mg, 4.8 mmol, 3 equiv) intoluene (400 mL), which had also been initial sparged with nitrogen for15 minutes. After completing the addition, the resulting mixture wasstirred at reflux for thirty minutes, then cooled to room temperature(˜22° C.) before 200 mL of water was added. The layers were separatedand the organic layer was concentrated under reduced pressure. Theresidue was purified by column chromatography to yield(1²Z,5²Z)-3-phenyl-1¹H,5¹H-3-aza-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzena-cycloheptaphane(42) as an off-white solid (222 mg, 39% yield).

Synthesis of PtM1

A mixture of(1²Z,5²Z)-3-phenyl-1¹H,5¹H-3-aza-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzena-cycloheptaphane(42) (190 mg, 0.47 mmol, 1 equiv), potassium tetrachloroplatinate (490mg, 1.18 mmol, 2.5 equiv), and tetrabutylammonium chloride (328 mg, 1.18mmol, 2.5 equiv) in acetic acid (10 mL) was sparged with nitrogen for 15minutes. The slurry was stirred at 110° C. for 3 days. The mixture wascooled and the solid was filtered. The solid was washed with deionizedwater (5 mL) and MTBE (5 ml). The crude product was purified by columnchromatography to yield PtM1 as a yellow solid (74 mg, 26% yield).

Synthesis of Comparative Example 15

The following is a general scheme for synthesizing Comparative Example15, and is followed by more detailed explanation of the scheme.

Synthesis of (1E,7E)-1,8-bis(Dimethylamino)octa-1,7-diene-3,6-dione (43)

A mixture of 2,5-hexandedione (26 g, 226 mmol, 1 equiv) andN,N-dimethylformamide dimethyl acetal (100 mL, 752 mmol, 3.3 equiv) wasrefluxed overnight (˜12 hours). The mixture was then concentrated underreduced pressure. The residue was purified by column chromatography togive partially purified(1E,7E)-1,8-bis(Dimethylamino)octa-1,7-diene-3,6-dione (43) (20 g) as ablack oil.

Synthesis of 1,2-Di(1H-pyrazol-3-yl)ethane (44)

A mixture of crude(1E,7E)-1,8-bis(Dimethylamino)octa-1,7-diene-3,6-dione (43) (5 g, 22.4mmol, 1 equiv) and hydrazine monohydrate (4.8 mL, 98.6 mmol, 4.4 equiv)in ethanol (200 mL) was refluxed overnight (˜12 hours). The mixture wasconcentrated under reduced pressure to give crude1,2-di(1H-pyrazol-3-yl)ethane (44) (5.4 g) as a black oil, which wasused without further purification.

Synthesis of di-tert-butyl3,3′-(ethane-1,2-diyl)bis(1H-pyrazole-1-carboxylate) (45)

A mixture of 1,2-di(1H-pyrazol-3-yl)ethane (44) (5.4 g, ˜33 mmol, 1equiv), di-tert-butyl dicarbonate (21.8 g, 99.9 mmol, 3 equiv), and4-dimethylaminopyridine (40 mg, 0.33 mmol, 0.01 equiv) indichloromethane (100 mL) was stirred at room temperature (˜22° C.)overnight (˜12 hours). The mixture was concentrated under reducedpressure. The residue was purified by column chromatography to givedi-tert-butyl 3,3′-(ethane-1,2-diyl)bis(1H-pyrazole-1-carboxylate) (45)(7 g, 59% yield) as a yellow oil.

Synthesis of 1,2-Di(1H-pyrazol-3-yl)ethane dihydrochloride (46.2HCl)

4M HCl in dioxane (88 mmol, 4.55 equiv) was added to a solution ofdi-tert-butyl 3,3′-(ethane-1,2-diyl)bis(1H-pyrazole-1-carboxylate) (45)(7 g, 19.3 mmol, 1 equiv) in 1,4-dioxane (35 mL). The slurry was stirredat room temperature (˜22° C.) for 2 hours. The solvent was decanted andthe residue was washed sequentially with heptanes (25 mL) and MTBE (25mL). The solid was dried under vacuum at 40° C. for 4 hours to yield1,2-di(1H-pyrazol-3-yl)ethane dihydrochloride (46.2HCl) (5 g) as a tansolid.

Synthesis of 3,3′-Oxybis(iodobenzene) (47)

A mixture of 3-iodophenol (10 g, 45.4 mmol, 1 equiv), 1,3-diiodobenzene(30 g, 90.8 mmol, 2 equiv), copper(I) iodide (1.7 g, 9.1 mmol, 0.2equiv), potassium phosphate (19.2 g, 90.8 mmol, 2 equiv), and picolinicacid (2.2 g, 18.2 mmol, 0.4 equiv) in methyl sulfoxide (500 mL) wassparged with nitrogen for 15 minutes. The slurry was stirred at 90° C.for 5 hours. The resulting mixture was cooled and poured into ice water(400 mL) and MTBE (100 mL). The layers were separated and the aqueouslayer was extracted twice with MTBE (300 mL). The combined organiclayers were filtered through a pad of Celite (silica gel) andconcentrated under reduced pressure. The residue was purified by columnchromatography to give 3,3′-Oxybis(iodobenzene) (47) as a white solid(9.7 g, 51% yield).

Synthesis of(12Z,52Z)-11H,51H-3-Oxa-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzenacycloheptaphane(48)

A mixture of 47 (4.68 g, 11.1 mmol, 1 equiv), 46˜2HCl (3.1 g, 11.1 mmol,1 equiv), copper(II) acetate monohydrate (112 mg, 0.56 mmol, 0.05equiv), and cesium carbonate (21.7 g, 66.6 mmol, 6 equiv) in DMF (4 L)was sparged with nitrogen for 20 minutes. The slurry was stirred at 110°C. for 8 days. Copper (II) acetate monohydrate (112 mg, 0.56 mmol, 0.05equiv) was added and the mixture was stirred at 130° C. for 3 additionaldays. The solvent was removed under reduced pressure and the residue wasdiluted with water (300 mL) and ethyl acetate (300 mL). The layers wereseparated and the aqueous layer was extracted twice with ethyl acetate(300 mL). The combined organic layers were washed with saturated brine(200 mL) and concentrated under reduced pressure. The residue waspurified by column chromatography to yield(12Z,52Z)-11H,51H-3-Oxa-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzenacycloheptaphane(48) as an off-white solid (128 mg, 4% yield).

Synthesis of Comparative Example 15

A mixture of(12Z,52Z)-11H,51H-3-Oxa-1,5(1,3)-dipyrazola-2,4(1,3)-dibenzenacycloheptaphane(48) (125 mg, 0.38 mmol, 1 equiv), potassium tetrachloroplatinate (261mg, 0.63 mmol, 1.6 equiv) in acetic acid was sparged with nitrogen for20 minutes. The slurry was stirred at 110° C. for 2 days. The mixturewas cooled and the solid was filtered. The solid was washed with waterand MTBE. The solid and the filter paper were stirred in DMSO (6.5 mL)and filtered through syringe filter to give a solution of crude 7. TheDMSO solution was purified by a preparative HPLC to give ComparativeExample 15 as a yellow solid (16 mg, 8% yield).

Compound Data

Density functional theory calculations were performed on PtM1 andComparative Example 15 in order to compare relative energy levels.

Calculations were performed with the Gaussian 09 package using the B3LYPfunctional and CEP-31g basis set with THF solvent polarization.Calculated (calc) and experimental (exp) values for HOMO, LUMO and T1values are shown in Table 2. The experimental triplet values weremeasured as the highest energy peak wavelength in 2-methyl THF solventat 77K. Solution cyclic voltammetry (CV) and differential pulsedvoltammetry (DPV) were performed using a CH Instruments model 6201Bpotentiostat using anhydrous dimethylformamide solvent andtetrabutylammonium hexafluorophosphate as the supporting electrolyte. Aglassy carbon, platinum and silver wire were used as the working,counter and reference electrodes, respectively. Electrochemicalpotentials were referenced to an internal ferrocene-ferroconium redoxcouple (Fc/Fc⁺) by measuring the peak potential differences fromdifferential pulsed voltammetry. HOMO and LUMO energies were determinedby referencing the cationic and anionic redox potentials to ferrocene(4.8 eV vs. vacuum).

TABLE 2 HOMO LUMO T1 calc HOMO LUMO T1 exp calc (eV) calc (eV) (nm) exp(eV) exp (eV) (nm) PtM1 −4.92 −1.59 517 −4.99 −1.94 487 Comparative−5.40 −1.69 465 −5.32 −2.02 445 Example 15

Table 2 shows that the HOMO energy of PtM1 with an aryl amine bottomtether is both predicted by calculation and measured experimentally tohave a lower oxidation potential than Comparative Example 15. Insolution electrochemistry, PtM1 has a lower oxidation potential by 0.33V than Comparative Example 15. In addition, the fact Compound PtM1exhibits reversible oxidation in cyclic voltammetry compared toirreversible oxidation for Comparative Example 15, may indicate CompoundPtM1 exhibits better oxidation stability. These are desirable featuresin a device due to the effect of hole trapping, both of which may leadto improved efficiency and stability, and also reduces the need forcharge blocking layers. For these reasons, macrocyclic compoundscontaining a readily oxidized arylamine that bridges the phenyl ringsmay be preferable over oxygen bridged analogues.

Device and PL Data

The structures for Compound Ir872 and Comparative Example 13 are shownbelow:

The emission spectra of Compound Ir872 and Comparative Compound 13 in2-methyl THF solvent at 77K and room temperature are shown in FIGS. 4and 5, respectively. It is found that the compounds described herein aremarkedly blue shifted from the comparative example with vibronic peakemission starting around 470 nm. The comparative example shows a highenergy peak in the same region and a broad Gaussian peak that isredshifted. Though not wishing to be bound by theory, the differencebetween the two compounds is thought to be caused by the rigidity of thestrapped phenylpyrazole ligand. Though not wishing to be bound bytheory, it is also believed, in the case of the non-strapped comparativeexample, that a vibration or distortion associated with a very weak Ir—Nbond leads to a broad intraligand charge transfer transition (ILCT).When this metal ligand bond is strengthened by adding a strap, theemission comes from a characteristic MLCT transition on theaza-phenanthridine benzimidazole ligand (APBI), similar to what isobserved for tris compounds with this ligand.

Additional heteroleptic examples, Complex Ir890, Complex Ir891,Comparative Example 14 and Comparative Example 16, with green emittingphenylpyridine ligands are also compared.

The emission spectra of Compound Ir890 and Comparative Example 14 dopedin a polymethylmethacrylate (PMMA) drop cast matrix at 5 wt % is shownin FIG. 6. Contrary to what was observed for Compound Ir872 andComparative Example 13, the emission is very similar. Both CompoundIr890 and Comparative Example 14 were measured to have aphotoluminescent quantum yield (PLQY) of 99% in PMMA matrix.

Device Examples

OLEDs were fabricated with both Compound Ir890, Compound Ir891,Comparative Example 14, and Comparative Example 16

Device 1=LG101 (100 Å)/HTL1 (450 Å)/Host 1: Comparative Example 16(400Å, 10%)/BL1 (50 Å)/AlQ3 (350 Å)/LiF/Al

Device 2=LG101 (100 Å)/HTL1 (450 Å)/Host 1: Comparative Example 14 (300Å, 10%)/BL1 (50 Å)/AlQ3 (450 Å)/LiF/Al

Device 3=LG101 (100 Å)/HTL1 (450 Å)/Host 1: Compound Ir890 (400 Å,10%)/BL1 (50 Å)/AlQ3 (350 Å)/LiF/Al

Device 4=LG101 (100 Å)/HTL1 (450 Å)/Host 1: Compound Ir891 (400 Å,10%)/BL1 (50 Å)/AlQ3 (350 Å)/LiF/Al

As shown in Table 3, below, devices prepared using emissive compoundswith a side strap to the ancillary phenylpyrazole ligand exhibitimproved device lifetime between 5 to 27 times over Comparative Example15. These results suggest that the side-strapping group can improvedevice stability. There are no obvious negative effects on other deviceperformance properties, with Compound Ir890 and Compound Ir891 showinghigher LE and EQE than either comparative example.

TABLE 3 At 10 mA/cm2 LT_(80%) @ 40 1931 CIE Voltage LE EQE PE mA/cm² x y[norm] [norm] [norm] [norm] [norm] Device 1 0.294 0.629 1.0 1.0 1.0 1.01.0 Device 2 0.293 0.628 0.9 0.8 0.8 0.9 1.7 Device 3 0.317 0.63 1.0 1.31.2 1.2 5.4 Device 4 0.312 0.629 1.1 1.1 1.0 1.0 27.4

It is understood that the various embodiments described herein are byway of example only, and are not intended to limit the scope of theinvention. For example, many of the materials and structures describedherein may be substituted with other materials and structures withoutdeviating from the spirit of the invention. The present invention asclaimed may therefore include variations from the particular examplesand preferred embodiments described herein, as will be apparent to oneof skill in the art. It is understood that various theories as to whythe invention works are not intended to be limiting.

We claim:
 1. A compound having a Formula:

wherein R¹¹, and R¹² each independently represent mono, or disubstitution, or no substitution; wherein R¹³ and R¹⁴ each independentlyrepresent mono, di, tri, or tetra substitution, or no substitution;wherein L¹¹ represents a linking group with a structure selected fromthe group consisting of

wherein L¹² represents NR¹⁵; wherein R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷,R¹⁸, R¹⁹, R²⁰, and R²¹ are each independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof; and wherein any adjacentL¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷, R¹⁸, R¹⁹, R²⁰ and R²¹ areoptionally joined to form a fused or unfused ring.
 2. The compound ofclaim 1, wherein L¹¹ is selected from the group consisting of:


3. The compound of claim 1, wherein L¹¹ is selected from the groupconsisting of:


4. The compound of claim 1, wherein R¹⁵ comprises phenyl.
 5. Thecompound of claim 1, wherein L¹² is selected from the group consistingof:


6. A compound having a Formula:

wherein R¹¹, and R¹² each independently represent mono, or disubstitution, or no substitution; wherein R¹³ and R¹⁴ each independentlyrepresent mono, di, tri, or tetra substitution, or no substitution;wherein L¹¹ represents a linking group selected from the groupconsisting of alkyl, cycloalkyl, aryl, and heteroaryl; wherein L¹²represents a linking group selected from the group consisting of NR¹⁵,and PR¹⁵; wherein R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are each independentlyselected from the group consisting of hydrogen, deuterium, halide,alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino,silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl,acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl,sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein anyadjacent L¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are optionally joined toform a fused or unfused ring, wherein at least one pair of adjacent L¹¹,L¹², R¹¹, R¹², R¹³, R¹⁴, and R¹⁵ are joined or fused into a ring.
 7. Thecompound of claim 1, wherein the compound has the formula:

wherein R²² represents mono, di, tri, tetra, or penta substitution, orno substitution; wherein R¹⁶, R¹⁷, R¹⁸, R¹⁹, and R²² are eachindependently selected from the group consisting of hydrogen, deuterium,halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinationsthereof; and wherein any adjacent R¹⁶, R¹⁷, R¹⁸, R¹⁹, and R²² areoptionally joined to form a fused or unfused ring.
 8. The compound ofclaim 7, wherein the compound has the formula:


9. The compound of claim 1, wherein the compound is selected from thegroup consisting of: Compound PtM1 through PtM12, each represented bythe formula

wherein in Compound PtM1: R = H, in Compound PtM2: R = Me, in CompoundPtM3: R = Et, in Compound PtM4: R = ^(i)Pr, in Compound PtM5: R =neopentyl, in Compound PtM6: R = ^(i)Bu, in Compound PtM7: R = ^(t)Bu,in Compound PtM8: R = Ph, in Compound PtM9: R = 4-biphenyl, in CompoundPtM10: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM11: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM12: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM13 through PtM21, eachrepresented by the formula

where in Compound PtM13: R = Me, in Compound PtM14: R = Et, in CompoundPtM15: R = ^(i)Pr, in Compound PtM16: R = neopentyl, in Compound PtM17:R = ^(i)Bu, in Compound PtM18: R = ^(t)Bu, in Compound PtM19: R = Ph, inCompound PtM20: R = 2,6-(Me)₂Ph, in Compound PtM21: R = 2,6-(^(i)Pr)₂Ph,Compound PtM22 through PtM30, each represented by the formula

wherein in Compond PtM22: R = Me, in Compond PtM23: R = Et, in CompondPtM24: R = ^(i)Pr, in Compond PtM25: R = neopentyl, in Compond PtM26: R= ^(i)Bu, in Compond PtM27: R = ^(t)Bu, in Compond PtM28: R = Ph, inCompond PtM29: R = 2,6-(Me)₂Ph, in Compond PtM30: R = 2,6-(^(i)Pr)₂Ph,Compound PtM31 through PtM42, each represented by the formula

wherein in Compound PtM31: R = H, in Compound PtM32: R = Me, in CompoundPtM33: R = Et, in Compound PtM34: R = ^(i)Pr, in Compound PtM35: R =neopentyl, in Compound PtM36: R = ^(i)Bu, in Compound PtM37: R = ^(t)Bu,in Compound PtM38: R = Ph, in Compound PtM39: R = 4-biphenyl, inCompound PtM40: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM41: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM42: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM43 through PtM51, eachrepresented by the formula

wherein in Compound PtM43: R = Me, in Compound PtM44: R = Et, inCompound PtM45: R = ^(i)Pr, in Compound PtM46: R = neopentyl, inCompound PtM47: R = ^(i)Bu, in Compound PtM48: R = ^(t)Bu, in CompoundPtM49: R = Ph, in Compound PtM50: R = 2,6-(Me)₂Ph, in Compound PtM51: R= 2,6-(^(i)Pr)₂Ph, Compound PtM52 through PtM60, each represented by theformula

where in Compound PtM52: R = Me, in Compound PtM53: R = Et, in CompoundPtM54: R = ^(i)Pr, in Compound PtM55: R = neopentyl, in Compound PtM56:R = ^(i)Bu, in Compound PtM57: R = ^(t)Bu, in Compound PtM58: R = Ph, inCompound PtM59: R = 2,6-(Me)₂Ph, in Compound PtM60: R = 2,6-(^(i)Pr)₂Ph,Compound PtM61 through PtM72, each represented by the formula

wherein in Compound PtM61: R = H, in Compound PtM62: R = Me, in CompoundPtM63: R = Et, in Compound PtM64: R = ^(i)Pr, in Compound PtM65: R =neopentyl, in Compound PtM66: R = ^(i)Bu, in Compound PtM67: R = ^(t)Bu,in Compound PtM68: R = Ph, in Compound PtM69: R = 4-biphenyl, inCompound PtM70: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM71: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM72: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM73 through PtM81, eachrepresented by the formula

wherein in Compound PtM73: R = Me, in Compound PtM74: R = Et, inCompound PtM75: R = ^(i)Pr, in Compound PtM76: R = neopentyl, inCompound PtM77: R = ^(i)Bu, in Compound PtM78: R = ^(t)Bu, in CompoundPtM79: R = Ph, in Compound PtM80: R = 2,6-(Me)₂Ph, in Compound PtM81: R= 2,6-(^(i)Pr)₂Ph, Compound PtM82 through PtM90, each represented by theformula

wherein in Compound PtM82: R = Me, in Compound PtM83: R = Et, inCompound PtM84: R = ^(i)Pr, in Compound PtM85: R = neopentyl, inCompound PtM86: R = ^(i)Bu, in Compound PtM87: R = ^(t)Bu, in CompoundPtM88: R = Ph, in Compound PtM89: R = 2,6-(Me)₂Ph, in Compound PtM90: R= 2,6-(^(i)Pr)₂Ph, Compound PtM91 through PtM102, each represented bythe formula

wherein in Compound PtM91: R = H, in Compound PtM92: R = Me, in CompoundPtM93: R = Et, in Compound PtM94: R = ^(i)Pr, in Compound PtM95: R =neopentyl, in Compound PtM96: R = ^(i)Bu, in Compound PtM97: R = ^(t)Bu,in Compound PtM98: R = Ph, in Compound PtM99: R = 4-biphenyl, inCompound PtM100: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM101: R =2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM102: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM103 through PtM111, eachrepresented by the formula

wherein in Compound PtM103: R = Me, in Compound PtM104: R = Et, inCompound PtM105: R = ^(i)Pr, in Compound PtM106: R = neopentyl, inCompound PtM107: R = ^(i)Bu, in Compound PtM108: R = ^(t)Bu, in CompoundPtM109: R = Ph, in Compound PtM110: R = 2,6-(Me)₂Ph, in Compound PtM111:R = 2,6-(^(i)Pr)₂Ph, Compound PtM112 through PtM120, each represented bythe formula

wherein in Compound PtM112: R = Me, in Compound PtM113: R = Et, inCompound PtM114: R = ^(i)Pr, in Compound PtM115: R = neopentyl, inCompound PtM116: R = ^(i)Bu, in Compound PtM117: R = ^(t)Bu, in CompoundPtM118: R = Ph, in Compound PtM119: R = 2,6-(Me)₂Ph, in Compound PtM120:R = 2,6-(^(i)Pr)₂Ph, Compound PtM121 through PtM132, each represented bythe formula

wherein in Compound PtM121: R = H, in Compound PtM122: R = Me, inCompound PtM123: R = Et, in Compound PtM124: R = ^(i)Pr, in CompoundPtM125: R = neopentyl, in Compound PtM126: R = ^(i)Bu, in CompoundPtM127: R = ^(t)Bu, in Compound PtM128: R = Ph, in Compound PtM129: R =4-biphenyl, in Compound PtM130: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM131:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM132: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM133 through PtM141, eachrepresented by the formula

wherein in Compound PtM133: R = Me, in Compound PtM134: R = Et, inCompound PtM135: R =^(i)Pr, in Compound PtM136: R = neopentyl, inCompound PtM137: R = ^(i)Bu, in Compound PtM138: R = ^(t)Bu, in CompoundPtM139: R = Ph, in Compound PtM140: R = 2,6-(Me)₂Ph, in Compound PtM141:R = 2,6-(^(i)Pr)₂Ph, Compound PtM142 through PtM153, each represented bythe formula

wherein in Compound PtM142: R = H, in Compound PtM143: R = Me, inCompound PtM144: R = Et, in Compound PtM145: R = ^(i)Pr, in CompoundPtM146: R = neopentyl, in Compound PtM147: R = ^(i)Bu, in CompoundPtM148: R = ^(t)Bu, in Compound PtM149: R = Ph, in Compound PtM150: R =4-biphenyl, in Compound PtM151: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM152:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM153: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM154 through PtM162, eachrepresented by the formula

wherein in Compound PtM154: R = Me, in Compound PtM155: R = Et, inCompound PtM156: R = ^(i)Pr, in Compound PtM157: R = neopentyl, inCompound PtM158: R = ^(i)Bu, in Compound PtM159: R = ^(t)Bu, in CompoundPtM160: R = Ph, in Compound PtM161: R = 2,6-(Me)₂Ph, in Compound PtM162:R = 2,6-(^(i)Pr)₂Ph, Compound PtM163 through PtM174, each represented bythe formula

wherein in Compound PtM163: R = H, in Compound PtM164: R = Me, inCompound PtM165: R = Et, in Compound PtM166: R = ^(i)Pr, in CompoundPtM167: R = neopentyl, in Compound PtM168: R = ^(i)Bu, in CompoundPtM169: R = ^(t)Bu, in Compound PtM170: R = Ph, in Compound PtM171: R =4-biphenyl, in Compound PtM172: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM173:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM174: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM175 through PtM183, eachrepresented by the formula

wherein in Compound PtM175: R = Me, in Compound PtM176: R = Et, inCompound PtM177: R = ^(i)Pr, in Compound PtM178: R = neopentyl, inCompound PtM179: R = ^(i)Bu, in Compound PtM180: R = ^(t)Bu, in CompoundPtM181: R = Ph, in Compound PtM182: R = 2,6-(Me)₂Ph, in Compound PtM183:R = 2,6-(^(i)Pr)₂Ph, Compound PtM184 through PtM195, each represented bythe formula

wherein in Compound PtM184: R = H, in Compound PtM185: R = Me, inCompound PtM186: R = Et, in Compound PtM187: R = ^(i)Pr, in CompoundPtM188: R = neopentyl, in Compound PtM189: R = ^(i)Bu, in CompoundPtM190: R = ^(t)Bu, in Compound PtM191: R = Ph, in Compound PtM192: R =4-biphenyl, in Compound PtM193: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM194:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM195: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM196 through PtM204, eachrepresented by the formula

wherein in Compound PtM196: R = Me, in Compound PtM197: R = Et, inCompound PtM198: R = ^(i)Pr, in Compound PtM199: R = neopentyl, inCompound PtM200: R = ^(i)Bu, in Compound PtM201: R = ^(t)Bu, in CompoundPtM202: R = Ph, in Compound PtM203: R = 2,6-(Me)₂Ph, in Compound PtM204:R = 2,6-(^(i)Pr)₂Ph, Compound PtM205 through PtM216, each represented bythe formula

wherein in Compound PtM205: R = H, in Compound PtM206: R = Me, inCompound PtM207: R = Et, in Compound PtM208: R = ^(i)Pr, in CompoundPtM209: R = neopentyl, in Compound PtM210: R = ^(i)Bu, in CompoundPtM211: R = ^(t)Bu, in Compound PtM212: R = Ph, in Compound PtM213: R =4-biphenyl, in Compound PtM214: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM215:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM216: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM217 through PtM225, eachrepresented by the formula

wherein in Compound PtM217: R = Me, in Compound PtM218: R = Et, inCompound PtM219: R = ^(i)Pr, in Compound PtM220: R = neopentyl, inCompound PtM221: R = ^(i)Bu, in Compound PtM222: R = ^(t)Bu, in CompoundPtM223: R = Ph, in Compound PtM224: R = 2,6-(Me)₂Ph, in Compound PtM225:R = 2,6-(^(i)Pr)₂Ph, Compound PtM226 through PtM237, each represented bythe formula

wherein in Compound PtM226: R = H, in Compound PtM227: R = Me, inCompound PtM228: R = Et, in Compound PtM229: R = ^(i)Pr, in CompoundPtM230: R = neopentyl, in Compound PtM231: R = ^(i)Bu, in CompoundPtM232: R = ^(t)Bu, in Compound PtM233: R = Ph, in Compound PtM234: R =4-biphenyl, in Compound PtM235: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM236:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM237: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM238 through PtM246, eachrepresented by the formula

wherein in Compound PtM238: R = Me, in Compound PtM239: R = Et, inCompound PtM240: R = ^(i)Pr, in Compound PtM241: R = neopentyl, inCompound PtM242: R = ^(i)Bu, in Compound PtM243: R = ^(t)Bu, in CompoundPtM244: R = Ph, in Compound PtM245: R = 2,6-(Me)₂Ph, in Compound PtM246:R = 2,6-(^(i)Pr)₂Ph, Compound PtM247 through PtM258, each represented bythe formula

wherein in Compound PtM247: R = H, in Compound PtM248: R = Me, inCompound PtM249: R = Et, in Compound PtM250: R = ^(i)Pr, in CompoundPtM251: R = neopentyl, in Compound PtM252: R = ^(i)Bu, in CompoundPtM253: R = ^(t)Bu, in Compound PtM254: R = Ph, in Compound PtM255: R =4-biphenyl, in Compound PtM256: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM257:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM258: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM259 through PtM267, eachrepresented by the formula

wherein in Compound PtM259: R = Me, in Compound PtM260: R = Et, inCompound PtM261: R = ^(i)Pr, in Compound PtM262: R = neopentyl, inCompound PtM263: R = ^(i)Bu, in Compound PtM264: R = ^(t)Bu, in CompoundPtM265: R = Ph, in Compound PtM266: R = 2,6-(Me)₂Ph, in Compound PtM267:R = 2,6-(^(i)Pr)₂Ph, Compound PtM268 through PtM279, each represented bythe formula

wherein in Compound PtM268: R = H, in Compound PtM269: R = Me, inCompound PtM270: R = Et, in Compound PtM271: R = ^(i)Pr, in CompoundPtM272: R = neopentyl, in Compound PtM273: R = ^(i)Bu, in CompoundPtM274: R = ^(t)Bu, in Compound PtM275: R = Ph, in Compound PtM276: R =4-biphenyl, in Compound PtM277: R = 2,6-(^(i)Pr)₂Ph, in Compound PtM278:R = 2,6-(^(i)Pr)₂-4-biphenyl, in Compound PtM279: R =2,4-(^(i)Pr)₂-3-dibenzofuran, Compound PtM280 through PtM288, eachrepresented by the formula

wherein in Compound PtM280: R = Me, in Compound PtM281: R = Et, inCompound PtM282: R = ^(i)Pr, in Compound PtM283: R = neopentyl, inCompound PtM284: R = ^(i)Bu, in Compound PtM285: R = ^(t)Bu, in CompoundPtM286: R = Ph, in Compound PtM287: R = 2,6-(Me)₂Ph, in Compound PtM288:R = 2,6-(^(i)Pr)₂Ph, Compound PtM289 through PtM312, each represented bythe formula

wherein in Compound PtM289: R = Me, R′ = Me, in Compound PtM290: R = Me,R′ = ^(i)Pr, in Compound PtM291: R = Me, R′ = Ph, in Compound PtM292: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM293: R = ^(i)Pr, R′ = Me, inCompound PtM294: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM295: R =^(i)Pr, R′ = Ph, in Compound PtM296: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM297: R = Ph, R′ = Me, in Compound PtM298: R = Ph, R′ =^(i)Pr, in Compound PtM299: R = Ph, R′ = Ph, in Compound PtM300: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM301: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM302: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM303: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM304: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM305: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM306: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM307: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM308: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM309: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM310: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM311: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM312: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM313through PtM336, each represented by the formula

wherein in Compound PtM313: R = Me, R′ = Me, in Compound PtM314: R = Me,R′ = ^(i)Pr, in Compound PtM315: R = Me, R′ = Ph, in Compound PtM316: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM317: R = ^(i)Pr, R′ = Me, inCompound PtM318: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM319: R =^(i)Pr, R′ = Ph, in Compound PtM320: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM321: R = Ph, R′ = Me, in Compound PtM322: R = Ph, R′ =^(i)Pr, in Compound PtM323: R = Ph, R′ = Ph, in Compound PtM324: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM325: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM326: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM327: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM328: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM329: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM330: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM331: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM332: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM333: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM334: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM335: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM336: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM337through PtM360, each represented by the formula

wherein in Compound PtM337: R = Me, R′ = Me, in Compound PtM338: R = Me,R′ = ^(i)Pr, in Compound PtM339: R = Me, R′ = Ph, in Compound PtM340: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM341: R = ^(i)Pr, R′ = Me, inCompound PtM342: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM343: R =^(i)Pr, R′ = Ph, in Compound PtM344: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM345: R = Ph, R′ = Me, in Compound PtM346: R = Ph, R′ =^(i)Pr, in Compound PtM347: R = Ph, R′ = Ph, in Compound PtM348: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM349: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM350: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM351: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM352: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM353: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM354: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM355: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM356: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM357: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM358: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM359: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM360: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM361through PtM384, each represented by the formula

wherein in Compound PtM361: R = Me, R′ = Me, in Compound PtM362: R = Me,R′ = ^(i)Pr, in Compound PtM363: R = Me, R′ = Ph, in Compound PtM364: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM365: R = ^(i)Pr, R′ = Me, inCompound PtM366: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM367: R =^(i)Pr, R′ = Ph, in Compound PtM368: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM369: R = Ph, R′ = Me, in Compound PtM370: R = Ph, R′ =^(i)Pr, in Compound PtM371: R = Ph, R′ = Ph, in Compound PtM372: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM373: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM374: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM375: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM376: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM377: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM378: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM379: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM380: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM381: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM382: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM383: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM384: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM385through PtM408, each represented by the formula

wherein in Compound PtM385: R = Me, R′ = Me, in Compound PtM386: R = Me,R′ = ^(i)Pr, in Compound PtM387: R = Me, R′ = Ph, in Compound PtM388: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM389: R = ^(i)Pr, R′ = Me, inCompound PtM390: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM391: R =^(i)Pr, R′ = Ph, in Compound PtM392: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM393: R = Ph, R′ = Me, in Compound PtM394: R = Ph, R′ =^(i)Pr, in Compound PtM395: R = Ph, R′ = Ph, in Compound PtM396: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM397: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM398: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM399: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM400: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM401: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM402: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM403: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM404: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM405: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM406: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM407: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM408: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM409through PtM432, each represented by the formula

wherein in Compound PtM409: R = Me, R′ = Me, in Compound PtM410: R = Me,R′ = ^(i)Pr, in Compound PtM411: R = Me, R′ = Ph, in Compound PtM412: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM413: R = ^(i)Pr, R′ = Me, inCompound PtM414: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM415: R =^(i)Pr, R′ = Ph, in Compound PtM416: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM417: R = Ph, R′ = Me, in Compound PtM418: R = Ph, R′ =^(i)Pr, in Compound PtM419: R = Ph, R′ = Ph, in Compound PtM420: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM421: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM422: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM423: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM424: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM425: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM426: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM427: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM428: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM429: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM430: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM431: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM432: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM433through PtM456, each represented by the formula

wherein in Compound PtM433: R = Me, R′ = Me, in Compound PtM434: R = Me,R′ = ^(i)Pr, in Compound PtM435: R = Me, R′ = Ph, in Compound PtM436: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM437: R = ^(i)Pr, R′ = Me, inCompound PtM438: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM439: R =^(i)Pr, R′ = Ph, in Compound PtM440: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM441: R = Ph, R′ = Me, in Compound PtM442: R = Ph, R′ =^(i)Pr, in Compound PtM443: R = Ph, R′ = Ph, in Compound PtM444: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM445: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM446: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM447: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM448: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM449: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM450: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM451: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM452: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM453: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM454: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM455: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM456: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph, Compound PtM457through PtM480, each represented by the formula

wherein in Compound PtM457: R = Me, R′ = Me, in Compound PtM458: R = Me,R′ = ^(i)Pr, in Compound PtM459: R = Me, R′ = Ph, in Compound PtM460: R= Me, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM461: R = ^(i)Pr, R′ = Me, inCompound PtM462: R = ^(i)Pr, R′ = ^(i)Pr, in Compound PtM463: R =^(i)Pr, R′ = Ph, in Compound PtM464: R = ^(i)Pr, R′ = 2,6-(^(i)Pr)₂Ph,in Compound PtM465: R = Ph, R′ = Me, in Compound PtM466: R = Ph, R′ =^(i)Pr, in Compound PtM467: R = Ph, R′ = Ph, in Compound PtM468: R = Ph,R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM469: R = 2,6-(^(i)Pr)₂Ph, R′ = Me,in Compound PtM470: R = 2,6-(^(i)Pr)₂Ph, R′ = ^(i)Pr, in CompoundPtM471: R = 2,6-(^(i)Pr)₂Ph, R′ = Ph, in Compound PtM472: R =2,6-(^(i)Pr)₂Ph, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM473: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Me, in Compound PtM474: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = ^(i)Pr, in Compound PtM475: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = Ph, in Compound PtM476: R =2,6-(^(i)Pr)₂-4-biphenyl, R′ = 2,6-(^(i)Pr)₂Ph, in Compound PtM477: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Me, in Compound PtM478: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = ^(i)Pr, in Compound PtM479: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = Ph, in Compound PtM480: R =2,4-(^(i)Pr)₂-3-dibenzofuran, R′ = 2,6-(^(i)Pr)₂Ph.


10. A first device comprising a first organic light emitting device, thefirst organic light emitting device comprising: an anode; a cathode; andan organic layer, disposed between the anode and the cathode, comprisinga compound having a Formula:

wherein R¹¹, and R¹² each independently represent mono, or disubstitution, or no substitution; wherein R¹³ and R¹⁴ each independentlyrepresent mono, di, tri, or tetra substitution, or no substitution;wherein L¹¹ represents a linking group with a structure selected fromthe group consisting of

wherein L¹² represents NR¹⁵; wherein R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷,R¹⁸, R¹⁹, R²⁰, and R²¹ are each independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof; and wherein any adjacentL¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷, R¹⁸, R¹⁹, and R²¹ areoptionally joined to form a fused or unfused ring.
 11. The first deviceof claim 10, wherein the first device is selected from the groupconsisting of a consumer product, an electronic component module, anorganic light-emitting device, and a lighting panel.
 12. The firstdevice of claim 10, wherein the organic layer is an emissive layer andthe compound is an emissive dopant or a non-emissive dopant.
 13. Thefirst device of claim 10, wherein the organic layer further comprises ahost, wherein the host comprises a triphenylene containing benzo-fusedthiophene or benzo-fused furan; wherein any substituent in the host isan unfused substituent independently selected from the group consistingof C_(n)H_(2n+1), OC_(n)H_(2n+1), OAr₁, N(C_(n)H_(2n+1))₂, N(Ar₁)(Ar₂),CH═CH—C_(n)H_(2n+1), C≡CC_(n)H_(2n+1), Ar₁, Ar₁-Ar₂, andC_(n)H_(2n)—Ar₁; wherein n is from 1 to 10; and wherein Ar₁ and Ar₂ areindependently selected from the group consisting of benzene, biphenyl,naphthalene, triphenylene, carbazole, and heteroaromatic analogsthereof.
 14. The first device of claim 10, wherein the organic layerfurther comprises a host; wherein the host comprises at least onechemical group selected from the group consisting of triphenylene,carbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene,azatriphenylene, azacarbazole, aza-dibenzothiophene, aza-dibenzofuran,and aza-dibenzoselenophene.
 15. The first device of claim 10, whereinthe organic layer further comprises a host, wherein the host is selectedfrom the group consisting of:

and combinations thereof.
 16. The first device of claim 10, wherein theorganic layer further comprises a host and the host comprises a metalcomplex.
 17. The first device of claim 10, wherein the first device isone of a flat panel display, a computer monitor, a medical monitor, atelevision, a billboard, a light for interior or exterior illuminationand/or signaling, a heads-up display, a fully or partially transparentdisplay, a flexible display, a laser printer, a telephone, a cell phone,a tablet, a phablet, a personal digital assistant (PDA), a laptopcomputer, a digital camera, a camcorder, a viewfinder, a micro-display,a 3-D display, a vehicle, an area wall, theater or stadium screen, and asign.
 18. A formulation comprising a compound selected from the groupconsisting of a compound having a Formula:

wherein R¹¹, and R¹² each independently represent mono, or disubstitution, or no substitution; wherein R¹³ and R¹⁴ each independentlyrepresent mono, di, tri, or tetra substitution, or no substitution;wherein L¹¹ represents a linking group with a structure selected fromthe group consisting of

wherein L¹² represents NR¹⁵; wherein R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷,R¹⁸, R¹⁹, R²⁰, and R²¹ are each independently selected from the groupconsisting of hydrogen, deuterium, halide, alkyl, cycloalkyl,heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl,carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl,sulfonyl, phosphino, and combinations thereof; and wherein any adjacentL¹¹, L¹², R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶, R¹⁷, R¹⁸, R¹⁹, R²⁰, and R²¹ areoptionally joined to form a fused or unfused ring.
 19. The compound ofclaim 1, wherein L¹¹ is